Test 1 Review
Test 1 Review Physics 1320
Popular in Elementary Physics 2 (Phys 1320)
Popular in Physics 2
This 56 page Study Guide was uploaded by Cassie Aramil on Sunday September 27, 2015. The Study Guide belongs to Physics 1320 at Texas State University taught by Dr. David Wolf in Fall 2015. Since its upload, it has received 319 views. For similar materials see Elementary Physics 2 (Phys 1320) in Physics 2 at Texas State University.
Reviews for Test 1 Review
Report this Material
What is Karma?
Karma is the currency of StudySoup.
You can buy or earn more Karma at anytime and redeem it for class notes, study guides, flashcards, and more!
Date Created: 09/27/15
Physic s Review 1 Magnetic eld strength about a magnet is strongest where magnetic eld lines are 1 LJ generator 2 kelvo age 4 LJ also induced b Earth39s magnetic eld is 1 Lil perpendicular to eachother 2 north to south 4 LJ magnetic eld b If you stretch a copper wire so that it is thinner the resistance between its ends 2 LJ series 3 Li energy 4 LI Neither b Induced electric and magnetic elds result in 1 Lil less than 1 cms 2 LI electric eld 4 LJ increases b If a magnet produces a force on a currentcarrying wire the wire 1 LJ MORE in parallel 2 Guides magnetic eld lines 4 L an incandescent lamp Over geologic history the Earth39s magnetic eld 1 LJ also reverses direction 2 L The current remains unchanged 4 L direction is changed Magnetic eld strength inside a currentcarrying coil will be greater if the coil encloses a 2 Li 6 Ohms 3 LJ 24 Ohms 4 Li a proton Electrons that are energized to glow in the lament of a common ac lamp are 1 LJ energy transfer 2 Li a conductor and insulator 3 La an incandescent lamp A currentcarrying loop of wire experiences no tendency to rotate in a magnetic eld when 1 LJ an incandescent lamp 2 Lil perpendicular to eachother 4 LJ twice its normal value Consider the three parts of the circuit the top branch with two bulbs the middle branch with one bulb the battery Rank the CURRENT through each from greatest to least 2 LJ short range not that strong 3 c B A most light bulbs to least light bulbs 4 lEJ the net spins of many of it electrons are aligned b A device that transforms mechanical energy into electrical energy is a 1 tglvohage 2 Lil power 3 letquot motor b A positivelycharged rod is held near an aluminum can that rests on a dry wood table If you momentarily touch the opposite side of the can with your nger the can becomes 1 U voltage source 2 Li loosely bound 4 LI charge b When current reverses direction in a wire the surrounding magnetic eld 1 U electron 2 Li a magnetic eld 3 Li energy transfer b Using the formula power current gtlt voltage nd the current drawn by a 800W toaster connected to 90 V 2 ll14quot closer together 4 80gtlt10quot 19 c b A currentcarrying coil of wire is 1 letsquot electron 2 lily N 5 electrons 4 new an electric generator b A galvanometer indicates 2 new Amps X Volts 3 NJ electron 4 letsquot 6Joues b A beam of electrons can pass through a magnetic eld without being de ected if the direction of the beam is 1 lessquot electric eld 2 letsquot all the same 3 21 input power line l I b A coulomb of charge owing in a bulb lament powered by a 6volt battery is provided with 1 lle north 3 NJ 6 Ohms b What is the effect on the current in a wire if both the voltage across it and its resistance are DOUBLED 2 LJ moving electric charge 3 LJ electromagnetic waves 4 lelsl have a current in it b Rank the circuits illustrated according to the brightness of the identical bulbs from brightest to dimmest 2 isltheload 3 LJ either 4 Lil Voltage b A generator armature is more dif cult to rotate when supplying electric current due to 1 magnetic sensors in their heads 2 LJ Guides magnetic eld lines 4 Li it induces a magnetic eld in the pipe that resists motion of the magnet b The electrical force on a 2C charge is 60 N The electric eld where the charge is located is 2 fl 3 LI 240 V 4 Lil moist b An electric diode is useful for 2 Ll magnetic domains 3 U a magnetic eld 4 L charge b Given that k90gtlt109Nm2C2 the proportionality constant for Coulomb39s law select the correct equations that show that the force between the charges is 81gtlt1010N 1 linput loutput X NsecondaryNprimary 21A X 15 042A z 1OV2A 5 Ohms 3 Liuovxz 220 Ohms b The energy dissipated in a light bulb in a circuit is provided by the 239 Iii power 3 3921s the same sign 4 ksitheload b The force that acts between a pair of magnetic poles depends on 1 Guides magnetic eld lines 2 it may experience a pair of torques 4 L repel the magnet as it enters b The current produced by a common generator is 1 1 F 2 i 4 11 60 V b Power is de ned as the energy expended per unit of time When translated to electrical terms power is equal to 1 Ll cu rrent 3 lylAmpsxva 4 tglvo age b a transformer transforms voltage while 1 Ll twice its normal value 2 changing ac to dc 3 Li lower resistance and is the brightest b No net force acts on a loop of wire in a magnetic eld when 1 l4 no eld lines pass through the loop 2 LJ Guides magnetic eld lines 3 Lil between the parallel wires of the line b When voltage is induced in a coil of wire current is 2 Li proton 3 Li less current 4 LJ Neither b What is the effect on the current in a wire if both the voltage across it and its resistance are HALVED 1 La electromagnetic waves 2 Li direction is changed 4 itsquot an electromagnet b One kilowatt is a unit of 1 100 w 2 AC 3 F2 b A lamp rated 23W 120V means that it will deliver 23 W when what 1 ll14quot electromagnetic waves 2 hisquot neither rotates or has a current 3 ll14quot a potential difference across its ends b To weaken a bar magnet 1 ll14quot the higher wattage 100 W 3 lets low so that overheating of the wires is minimized 4 letsquot perpendicular to eachother b Superconductors are noted for their 1 letsquot all moving electrical charges 2 letsquot a ow of electrons 3 3921quot also reverses direction b To become a positive ion an atom must 1 ll14quot loosely bound 2 H191 the same sign 4 LJ a ow of electrons b Thrust a magnet into the opening of a rubber band and it 1 L electric voltage and electric current 2 LJ current 3 Lil direction is changed b A heater draws 20A when connected to a 110V line If the electric power costs 20 cents per kilowatt hour the cost of running the heater for 10 hours is 1 LI motor 3 U zero 4 Isl b Each of the transformers shown is powered with 100 W and all have 100 turns on the primary The number of turns on each secondary varies as indicated Rank the power outputs in the secondaries from greatest to least 2 larger smaller or the same 3 repel the magnet as it enters 4 produces a force on the magnet b 23 Just as water flows from a region of high pressure to a region of low pressure electric charge flows from a region of 1 the electrical circuit itself 2 3 Ll attract a pair of orbiting electrons 4 LJ perpendicular to the magnetic eld b a transformer actually transforms 2 15 poles 3 L The same 4 LJ charge b A 60W and a 100W light bulb are rated at 120V Which bulb has a higher resistance 139 11 71 kV 2 U the higher wattage 100 W 3 3921s closer together b An iron core in a transformer 1 a water molecule 2 LJ electric eld 4 Lil exactly 100 N b Two point charges are separated by 54 cm The attractive force between them is 12 N Suppose that the charges attracting each other have equal magnitude Rearrange Coulomb39s law and nd the magnitude of each charge 1 12800 w 3 Q 560 c 4 10 J b If 10 of work is used in pushing 1 C of charge into an electric eld its electric potential relative to its starting position is 3 1 V 4 480 w b Electromagnetic induction is employed in 1 LI moving the wire near a magnet moving a magnet near the wire changing the current in a nearby wire 2 L electric voltage and electric current 3 L high electric pressure to a region of low electric pressure 4 b A reason for electric shielding inside a conductor is that any free electrons inside would 1 2 LJ The sudden collapse in the magnetic eld 3 U electrons already in the lament 4 L less than the resistance of either lamp b A 4ohm and 6ohm resistor connected in parallel have an equivalent resistance of 2 5 Ohms 3 240 v 4 6 Ohms b The electric eld inside an uncharged metal ball is zero If the ball is negatively charged the electric eld inside the ball is then 1 lets iron 4 LJ series b The primary of a transformer is the coil connected to 1 Lil all the same 2 LI either 4 LI north b Power is transmitted at high voltages because the corresponding current in the wires is 1 LJ between the parallel wires of the line 3 Ll increase the strength of the electromagnet 4 ALWAYS LESS than the resistance of the lowest resistor b By convention the direction of current in a circuit is 1 Ll The sudden collapse in the magnetic eld 2 LJ high electric pressure to a region of low electric pressure 3 Ll perpendicular to the magnetic eld b The magnetic elds of a pair of nearby magnets can i l 2 U a water molecule 3 LI electromagnetic waves 4 LJ voltage source b Find the cost of the operating a ZOOW lamp continuously for 1 week when the power utility rate is 17 centskWh 1 11 60 2 Lil ZERO 3 Li 1 F b A currentcarrying wire in a magnetic eld 1 2 LJ a ow of electrons 3 LJ the electrical circuit itself 4 electric eld b A beam of electrons passing through a magnetic eld experiences maximum de ection if the direction of the beam is 2 LJ electrons already in the lament 3 Ll superconducting coils 4 input power line b To say that electric charge is conserved means that no case has ever been found where 1 L negatively charged 2 Ll have a current in it 4 becomes concentrated b Magnetic eld lines about a currentcarrying wire 1 L direction is changed 3 Ll parallel to the eld lines 4 an electric generator b The source of electrons in a simple electric circuit is 1 Lil becomes concentrated 3 Li moving electric charge 4 LJ electromagnetic waves When the distance between two charges is halved the electrical force between them 1 Q 96 W 2 240 v 4 480 w Surrounding every moving electron is I l 2 LJ an electromagnet 3 LJ kinetic energy and speed 4 Lquot perpendicular to the magnetic eld The transmission of power from one place to another is evident in 1 La electric voltage and electric current 3 LJ magnetic sensors in their heads 4 LI lower resistance and is the brightest Just as in hydraulic circuits there is water pressure in electric circuits there is 1 La power 3 Li voltage source 4 LJ energy Voltage can be induced in a wire by 1 L short range not that strong 2 lJ not the same as the current that powers the distant load proportional to the voltage drop from beginning to end of each line rather low P U from the positive terminal of a source to the negative terminal the direction in which positive charge ows b Faraday39s law underlies the operation of 1 J an electric eld and magnetic eld 3 L high electric pressure to a region of low electric pressure 4 L net charge has been created or destroyed b The force exerted on an electron moving in a magnetic eld is maximum when the electron moves 1 La an electric eld 2 3921s produces a force on the magnet 3 L a magnetic eld b All bulbs are identical in the following circuits A voltmeter is connected across a single bulb to measure the voltage drop across it 1 is an electric eld and magnetic eld 2 110 v x 2 220 Ohms 39 4 l 1OV2A 5 Ohms Several paper clips dangle from the north pole of a magnet The induced pole in the bottom of the lowermost paper clip is a L VL ZERO 2 tl 240 3 51 5 A The force on an electron moving in a magnetic eld will be least when its direction is 1 Ll electric voltage and electric current 2 1lIIIIIIIIIIIIIIIIIIIIIIIIIIII 3 L perpendicular to the magnetic eld 4 U All the same if they have the same volts An ampere is a unit of electric 1 3921 either 2 Li 11 N 3 Ll series I I An electron is pushed into an electric eld where it acquires a 1V electrical potential If two electrons are pushed the same distance into the same electric eld the electrical potential of the two electrons is 1 1 zero 2 1 power 3 J F2 Magnetism is due to the motion of electrons as they 1 Lil produces a force on the magnet 2 LJ no eld lines pass through the loop 4 electrons already in the lament Solar winds headed in Earth39s direction are deviated mainly by 2 Lil a magnetic eld 3 LJ Guides magnetic eld lines 4 an electric eld In the eld induction credited to Maxwell wires 1 a magnetic eld 2 LJ also induced 4 Faraday39s law Current that is typically 60 hertz is 1 LJ less current 2 LJ a water molecule 4 closer together To see why atomic physicists ignore the effect of gravity within an atom calculate and compare the gravitational and electrical forces between an electron and a proton separated by 10 10m 139 1 71 kV 2 170 x 15 2600 w 3 b The induced electric and magnetic elds of Maxwell are 1 Ll generator 2 lU39 input power line 4 U closer together b The amount of current in a CFL rated 23W 120V is about 2 Li AC 3 U 240 V 4 LJ 5 A b Magnetic domains normally occur in 1 U Fq 2 lU39 cannot 4 hisquot AC b The bulbs shown are identical An ammeter is placed in different locations as shown Rank the current readings in the ammeter from greatest to least tr l l n 1 2 Li the same sign 3 U 12 ohms 4 U equally huge b Much of the charge on a conducting cube is I I 2 Li perpendicular to eachother 3 hisquot moves towards the rod 4 til absence of electric resistance b Neon signs require about 12000 volts to operate If the circuit uses a 120volt power source the ratio of primary to secondary turns on the transformer should be 2 l I l north 3 lIvl 440 4 LJ60 1 Ll moist 2 Ll power 3 lbl50hms b When an electron passes through the magnetic eld of a horseshoe magnet the electron39s 2 less rod of iron 3 til negatively charged 4 LJ energy and charge b An ef cient stepup transformer boosts 1 quot214 5 A 2 less Neither 3 LJ AC b Charge carriers in a metal are electrons rather than protons because electrons are 1 til electron 2 tsltheload 3 equally huge I I Three resistors take the shape of a triangle one resistor in each leg Resistance in one leg is 4 ohms 6 ohms in a second leg and a third leg 10 ohms Connecting an ohmmeter across the 10ohm resistor will show the equivalent resistance to be 2 L 16 N 3 L iron 4 Ll 5 Amps When Eddie Electron experiences an electrical shock the source of electrons composing the shock is 1 U aren39t needed 3 L iron 4 Li electric eld An iron rod becomes magnetic when 1 U tightly bound outer electrons 2 3 U between the parallel wires of the line 4 changes magnitude and direction with time The metal detectors that people walk through at airports operate via 1 exactly 100 N 2 12800 w 3 aren39t needed 4 A 34W nightlight is plugged into a 120V circuit and operates continuously for 1 year Find the resistance of its lament 1 LJ north 2 Lil electric eld 3 teltheload If an electric toaster rated at 110 V is accidently plugged into a 220V outlet the current drawn by the toaster will be 1 LJ all the same 2 Lil north pole 4 lets input power line For electric current in the home your power company supplies 1 LJ charge 2 Li Fq 3 lets battery tr l l l l Two light bulbs are connected to a battery one at a time The bulb that draws more current has the 1 LJ moves towards the rod 2 will perpendicular to the eld lines 4 letsquot direction is changed Which of these has the greatest mass proton or electron l I 2 lets 12 ohms 3 lets moist b Wood does not have magnetic properties because it contains no 1 Ll motor 2 24 Ohms 3 turned off b The conventional direction of magnetic eld lines outside a magnet are from I l 2 U The same 3 LJ closer together 4 LJ all the same b Disconnect a smallvoltage battery from a coil of many loops of wire and a large voltage may be produced by 1 perpendicular to the magnetic eld 2 Li produces a force on the magnet 3 Li Earth39s magnetic eld b Rearrange the equation current voltageresistance to express resistance in terms of current and voltage Then solve the following A certain device in a 80V circuit has a current rating of 30 A What is the resistance of the device how many ohms 1 quotll 28x 10 2 A I 3 J R 4200 4 I 71 kV b Electric charge distributes itself on conducting surfaces b 1 LI they have different ratios of wire turn for each i l 2 short range not that strong 3 LJ it induces a magnetic eld in the pipe that resists motion of the magnet Imagine a single charge q placed at one corner of a square and that the electric eld at the center of the square is Fq If two other equal charges are placed at the adjacent corners of the square leaving the opposite corner quotbankquot the electric eld at the center of the square IS 1 16 N z tl ZERo 3 F2 A 100W lamp glows brighter than a 25W lamp The electrical resistance of the 100W lamp is 2 U 10 V 3 U series 4 Isl Electric potential measured in volts is the ratio of electric energy to the amount of electric 1 LJ twice 3 Li energy 4 til 5 A A stepup transformer steps up voltage by ten times If voltage input is 120 volts voltage output is 1 tl 240 3 U ZERO b The discovery of electromagnetic induction is credited to 1 lessquot perpendicular to the eld lines 2 til the same as the magnetic eld direction 4 lle lower resistance and is the brightest b To connect a pair of resistors so their equivalent resistance the single resistor having their combined value will increase connect them in 2 ill either 3 J less 4 U 5 Ohms b Whereas electric charges can be isolated magnetic poles 1 30 MC 2 16 N 4 1200 v b The safety fuse in an electric circuit is connected to the circuit in 2 power 3 J 5 Ohms 4 Li current b 24 The source of all magnetism is 1 lessquot electron 2 Laquot N 5 electrons 4 led a magnetic eld b The primary coil of a transformer has ve times as many turns as the secondary coil The output current for the transformer is 21 A Select the correct equations that show that the input current is 042 A 2 no eld lines pass through the loop 3 Vout Vin X NsecondaryNprimary 120V X 10turns100turns 12V 4 ital all moving electrical charges b A droplet of ink in an industrial inkjet printer carries a charge of 11gtlt10 10 C and is de ected onto paper by a force of 37gtlt10 4 N Find the strength of the electric eld to produce this force 2 U N 5 electrons 3 l j I 89 A 4 170 x 15 2600 w b If a drop of mass 12gtlt10 14kg remains stationary in an electric eld of 147OX105NC what is the charge of this drop 1 2 39I R 4200 3 lIJ3 560 C 439 ill I It is said that electric charge is quantized which means that the charge on an object 1 produces a force on the magnet 2 Ll at right angles to the direction of the motion 3 LI they have different ratios of wire turn for each I I The rate at which energy is transferred is 1 4X 2 1 3 480 w 4 240 v Magnetic elds are produced by 1 negatively charged 2 Ll an electromagnet 3 U absence of electric resistance I I How many extra electrons are on this particular oil drop given the presently known charge of the electron 1 less 2 LJ series 3 led loosely bound I I Four amperes of current exist in the primary coil of a transformer The voltage across the primary coil is 120 V What is the power output of the secondary coil 1 16 N 4 240 v b The electric power supplied to a lamp that carries 2 A at 120 V is how many Watts 1 l 2 the higher wattage 100 W 71 kV 4 11 R 27 b The high voltage that is important in a power line is high voltage The high voltage that is important in a power line is high voltage 1 Ll produces a force on the magnet 2 MORE in parallel 3 Ll parallel to the eld lines b A fundamental rule of electricity is that 1 Ll changes magnitude and direction with time 2 led increase the strength of the electromagnet 4 less less than the resistance of either lamp b A compass needle in a magnetic eld 1 Ll cancel one another 2 may be de ected or experience a force 4 less an electric generator b When a bar magnet is thrust into a coil of copper wire the coil tends to 1 all the same 3 will less than 1 cms 4 led magnetic eld b A transformer produces 1 liliil increases temperature means increased resistance 2 lelsl increase the strength of the electromagnet 4 Lil net charge has been created or destroyed b The number of electrons delivered daily to an average American home by an average power utility in the early let century was 1 60 2 3 10 v b Each of the transformers shown is powered with 100 W and all have 100 turns on the primary The number of turns on each secondary varies as indicated Rank the currents in the secondaries from greatest to least 1 closer together 3 3921s no eld lines pass through the loop 4 lelsl electrons already in the lament b One kilowatthour is a unit of 1 57 I I 4 Ll less b Compared to a single lamp connected to a battery two identical lamps connected in series to the same battery will carry 1 Ll energy 3 U current 4 LI electric eld b Normally a small party balloon charged to several thousand volts will have a relatively small amount of 1 LI alternating current 3 U generator 4 Li also induced b Calculate the current in the 3200 filament of a bulb connected to a 90V line 1 Li a water molecule 2 LJ N 5 electrons 3 o 2 x 10quot6 c 4 J I b Consider the three parts of the circuit the top branch with two bulbs the middle branch with one bulb the battery Rank the VOLTAGE through each from greatest to least 1 Ll poles 2 Lil Neither 3 kgltheload I l b When voltage is stepped up in a transformer current is stepped down b b But Ohm39s law tells us that greater voltage means greater current not less current How then can current be lower when voltage is increased 1 All the same if they have the same volts 2 LJ greatest number of turns has the greatest voltage output 4 Ll not the same as the current that powers the distant load proportional to the voltage drop from beginning to end of each line rather low A device that transforms electrical energy to mechanical energy is a 1 LJ moist 2 Ll north 3 l I power Two charged particles repel each other with a force F If the distance and charge of one of the particles is doubled then the force will be 1 L 57 2 Li less 3 440 A balloon will stick to a wooden wall if the balloon is charged negatively or positively 1 LJ Neither 3 1 6 Ohms b The force a magnetic eld exerts on a currentcarrying wire is b maximum when the wire is oriented 1 a magnetic eld 2 LJ kinetic energy and speed 4 LJ parallel to the eld lines A 60W and a 100W light bulb are connected in parallel to a 120V outlet Which bulb draws more current 4 LJ the same sign b A transformer has an input of 6 V and an output of 24 V If the input is changed to 12 V select the correct equations that show that the output would be 48 V 1 LJ short range not that strong 2 120 x 2 240 Watts 4 Li mutually repeed towards its corners b When a magnet is moved to and fro in a wire coil voltage is induced If the coil has twice as many loops the voltage induced is 1 240 v 2 1 F 3 led series I I b The primary of a transformer connected to 120 V has 100 turns The secondary has 10 turns This is a stepdown transformer How do you show that the output voltage is 12 V 1 Ll may experience a pair of torques I I 3 NprimaryNsecondary VinputNoutput 12OV12V 10 4 they have different ratios of wire turn for each b When a currentcarrying wire is bent into a loop its magnetic eld inside the loop 1 3921 generator 2 Ll MORE in parallel 4 Ll lose an electron b Insulating materials are composed of atoms with 1 Ll a flow of electrons 3 Ll cancel one another 4 Laquot alternating current b Pigeons navigate primarily by 1 LJ cancel one another 2 LJ agree with your friend 4 U a magnetic eld b A friend says that changing electric and magnetic elds underlie the production of light 1 MORE in parallel 2 LJ direction is changed 3 U also induced b Surrounding every magnet is 1 2 3921 Amps X Volts 3 will a proton 4 LJ cannot b Two lamps with different lament thicknesses and therefore different resistances are connected in series Greater current is in the lamp with the 1 an incandescent lamp 3 LJ an electric eld 4 LI alternating current b The resistance of a lament that carries 2 A when a 10V potential difference across it is 2 170 x 15 2600 w 3 1 E 34X10A6 Vm 4 R 4200 b The current drawn by a 1200W toaster connected to 120 V is 10 A The resistance of the toaster coils is 3 24 Ohms 4 6 Ohms b A common naturallypolarized bit of matter is 1 La closer together 2 Lil magnetic eld 4 electron b An electric motor is very similar to 1 an electromagnet 2 Lil a magnetic eld 4 moving electric charge b Rapid change of a magnetic eld induces 1 LJ aren39t needed 2 Lil lose an electron 4 also induced b All bulbs are identical in the circuits shown An ammeter is connected next to the battery as shown Rank the current readings in the ammeter from greatest to least 1 U Divide Volts by turns to get the current 3 LJ spin on their axis and move around the nucleus 4 Lil decreases decreases as more lamps are connected b How many amperes flow through a 58 W bulb connected in a 110V circuit l E 2 3O KWh 3 10v 2A 5 Ohms 4 U N 5 electrons b Place an iron rod inside a currentcarrying coil of wire and you 1 L parallel to the eld lines 2 Ll an electromagnet 3 H has reversed direction man t39 I y Imes b The voltage across the input terminals of a transformer is 120 V The primary has 25 loops and the secondary has 50 loops The voltage the transformer delivers is 1 6 Ohms 2 less 3 zero 4 b The secondary of a transformer is the coil connected to 2 iiquot zero 3 1 96 W 4 proton b If you drop a bar magnet in a vertical copper pipe it will fall slowly because 1 LI an induced magnetic eld in the windings that resists change i I 3 LJ changes magnitude and direction with time 4 at right angles to the direction of the motion b 25 Electromagnetism unites 1 electrical 2 LJ an electric eld and magnetic eld 4 Lil an electric eld b The potential difference between a storm cloud and the ground is 100 million V If a charge of 12 C ashes in a bolt from cloud to Earth what is the change of potential energy of the charge 1 j E 34X10A6 Vm 439 111 I 028 A b Lillian safely touches a 100000volt Van de Graaff generator Although the voltage is high the relatively small amount of charge means a relatively small amount of 1 its increases 3 Ll energy 4 LJ electron b The electric eld established by a generator in an ac circuit 1 Ls eectricity and magnetism 3 L electric voltage and electric current 4 L lower resistance and is the brightest b Calculate the power of a hair dryer that operates on 170 V and draws a current of 15 A 1 I 89 A 3 3921 E 30 KWh Li R 10 O b Connect a pair of lamps in series and current is drawn from the battery Connect the same lamps in parallel and the current drawn is 4 2 Ll north pole 3 LJ rod of iron 4 LJ increases b Refrigerator magnets are typically 4 10v 2A 5 Ohms b A 34W nightlight is plugged into a 120V circuit and operates continuously for 1 year Find the energy consumed in a year 2 L R 10 Q 3 R 4200 4 L t 10 h b A 34W nightlight is plugged into a 120V circuit and operates continuously for 1 year Find the cost for a utility rate of 20 centsKWh for a year39s operation 1 m 2 440 4 1 AC b Assume that 10 of work pushes a charge initially at rest into an electric eld If the charge is then released it ies back to its starting position with a kinetic energy of 2 1 ZERO 3 Li moist 4 L 1 V b Underlying the concept of selfinduction is 1 60 v 2 magnetic eld 3 Eddie39s body I I b Particle A has twice the charge of nearby particle B Compared to the force on Particle A the force on Particle B is 1 Ll the same sign 3 U Voltage 4 Lil all the same b A suitable electric pump in an electric circuit is a 1 Lil negatively charged I I 339 J E 34x10quot6 Vm 4 Lil electromagnetic waves b Although a magnet can change the direction of travel of an electron beam it cannot change its 1 Lil direction is changed 2 Lil increases 3 Lil an electric eld I I b The voltage across the input terminals of a transformer is 120 V The primary has 50 loops and the secondary has 25 loops The voltage the transformer delivers is 1 1 60 2 1 V 3 480 w On some early automobiles both headlights failed when one bulb burned out The headlights were likely connected in 1 10 V 3 less either 4 Li less When two lamps are connected in parallel to a battery the electrical resistance that the battery senses is 1 have a current in it 2 LJ lower resistance and is the brightest 3 Li larger smaller or the same i l The direction of the force exerted on a moving charge in a magnetic eld is 1 Divide Volts by turns to get the current 2 3 led increase the strength of the electromagnet 4 Li also reverses direction A semiconductor can be 2 Li lose an electron 3 La north to south 4 L an electric generator Electrons can be transferred from one place to another by the process of 1 reducing its resistance and increasing the voltage across 2 Li changes magnitude and direction with time 3 the higher wattage 100 W b Direct current is normally produced by a 1 less power 2 LJ zero 4 Lil energy b An electric iron connected to a 110V source draws 94 A of current Find the charge ow through the iron in 1 minute 1 240 v 2 o 2 x 10quot6 c 3 Q I 89 A b A proton and an electron are placed in an electric eld Which undergoes the greater acceleration 1 Ll either 2 LJ uniform 4 Li a proton b If the primary of a transformer is connected to a dc power source the transformer would have a voltage output 1 a moving electrical charges 2 J may experience a pair of torques 4 La an electric eld b Two charges that are separated by one meter exert 1N forces on each other If the charges are pushed together so the separation is 25 centimeters the force on each charge will be 2 57 3 kL ZERo 4 480 w b Current in a conductor can be increased by 1 net charge has been created or destroyed 2 LJ perpendicular to eachother 4 Li neither energy power but voltage b Alternating current is normally produced by a 1 motor 2 U a proton 4 Lil electron b The pair of protons in the nucleus of a helium atom 2 LJ N 5 electrons 3 Ls also reverses direction 4 Li absence of electric resistance Between the consumer and the power plant most importantly are l l also induced 1 t1 increases 2 Amps X Volts b Electrons ow in a wire when there is l l 2 Ll changing ac to dc 3 Ll a conductor and insulator 4 Lil cancel one another b Disregarding the effects of friction a cyclist will coast farther when a lamp powered by a wheel generator is 1 Eli iron 3 Ll series 4 11 N b The output power of an ideal transformer is 1 Ll a conductor and insulator 3 Ll agree with your friend 4 LI Equal to the input power b When a change occurs in the magnetic eld in a closed loop of wire what happens 2 Ll The sudden collapse in the magnetic eld 3 Ll ALWAYS LESS than the resistance of the lowest resistor 4 Lil generator chemica battery b It is correct to say that in electric circuits 1 Ll electric voltage and electric current 3 not the same as the current that powers the distant load proportional to the voltage drop from beginning to end of each line rather low 4 short range not that strong b Compared to the huge force that attracts an iron tack to a strong magnet the force that the tack exerts on the magnet is 1 LJ electron 2 Lil charge 4 U the same sign b 22 The fundamental force underlying all chemical reactions is 1 La current 2 led generator 4 U electric eld b As more lamps are connected in a SERIES circuit the overall current in the power source 1 LJ spin on their axis and move around the nucleus 2 1 I ii 391 41 3 Li perpendicular to the magnetic eld 4 U mutually repelled towards its corners b A 60W light bulb connected to a 120V source draws a current of how many amps 3 1 96 W 4 LJ series b Two charged particles held close to each other are released As they move their speeds increase Therefore their charges have the same sign or different 1 Li moist 2 Li less 4 tglvohage b In units of measurement power in watts is equal to 1 24 Ohms 3 12 ohms 4 5 Ohms b A 34W nightlight is plugged into a 120V circuit and operates continuously for 1 year Find the current 139 11 I 028 A 4 120 x 2 240 Watts b The current in two identical light bulbs connected in series is 025 A The voltage across both bulbs is 110 V The resistance of a single light bulb is b Electric resistance in our skin is lowered when our skin is 1 Lil less 2 Ll twice 4 ll14quot poles b A power line with a resistance of 2 ohms carries a current of 80 A The power dissipated in the line is 2 LJ 1200 V 3 U 1 F 4 letsquot 57 b The drift speed of electrons that compose current in a ashlight is about 1 399 turned off 2 lets energy transfer 3 lessquot 24 Ohms l I b Electrons ow in an electrical circuit by tr l l n 1 2 lets parallel to the eld lines 3 Lil an electric eld 4 LJ magnetic eld b The power consumed by a device drawing 08 A when connected to 120 V is 1 1 F 2 100 w 3 16 N b Highvoltage wires in power lines are not highcurrent wires because the current in them is 2 Li greatest number of turns has the greatest voltage output 3 Li net charge has been created or destroyed 4 U at right angles to the direction of the motion b The equivalent resistance of any parallel branch in a circuit is 1 Ls produces a force on the magnet 3 Li Separation of distance and magnetic pole strength 4 absence of electric resistance b A transformer for a laptop computer converts a 120V input to a 12V output Select the correct equations that show that the primary coil has 10X as many turns as the secondary coil 1 when the voltage across it is 120 V 3 no eld lines pass through the loop 4 L perpendicular to eachother b Magnet A has twice the magnetic eld strength of Magnet B and at a certain distance pulls on magnet B with a force of 100 N The amount of force that magnet A exerts on magnet B is 1 iii 3 U electron 4 L111N b A galvanometer can be calibrated to measure 1 an electric eld and magnetic eld It 39 39 2 a movnng electrical charges 4 Lil neither rotates or has a current b Find the voltage change when an electric eld does 10 of work on a 000014C charge 1 o2x10N6c 3 11 R 100 439 11 t 10h b When you turn on a lamp the initial current in its lament is greater at rst rather than a moment later which indicates 1 absence of electric resistance 2 LJ changes magnitude and direction with time 4 LJ only while being connected or disconnected b Cosmic rays penetrate your body when 1 Li Separation of distance and magnetic pole strength 2 Lil changes magnitude and direction with time 4 Lquot they have different ratios of wire turn for each b Each of the transformers shown is powered with 100 W and all have 100 turns on the primary The number of turns on each secondary varies as indicated Rank the voltage output from greatest to least 1 LJ increases temperature means increased resistance 2 L at right angles to the direction of the motion 3 LJ increase the strength of the electromagnet b lnto which stable force eld can a proton be placed at rest without being acted upon by a force 1 LJ less current 2 battery 3 4 L 30 NC b A turbogenerator produces 1 LJ greatest number of turns has the greatest voltage output 3 Li transferring energy from one coil to another 4 neither energy power but voltage b The direction of an electric eld is the direction of the force exerted on 1 Lil generator 3 LJ power b The operation of a microwave oven makes use of 1 ALWAYS LESS than the resistance of the lowest resistor 3 an oscillating electric eld the polar nature of water molecules ip opping of polarized molecules 4 Li low so that overheating of the wires is minimized b A capacitor is useful in 1 moving electric charge 3 LJ negatively charged 4 L a water molecule b An electron beam directed through a magnetic eld 1 electric eld 3 LJ a conductor and insulator 4 Li absence of electric resistance b One joule per coulomb is a unit of JC 2 LJ 6Joues 3 LJ power 4 L energy b A certain transformer doubles input voltage If the primary coil draws 10 A of current then the current in the secondary coil is 1 16 N 2 5 Amps 3 2 AC b The equivalent combined resistance of 1ohm 2ohm and 3ohm in series is about 2 U 5 Ohms 3 lets 12 ohms 4 U 6Joules b If you wish to keep chicken warm in a shed on a cold night the best lamp to use is 1 Li less current 2 LJ aren39t needed 4 lessquot electrical b A superconducting magnet uses 1 Li series 2 less electric eld 3 lets alternating current b An ef cient stepdown transformer decreases 1 Li larger smaller or the same 2 U north to south 3 letsquot current X voltage b Using the equation current voltageresistance nd the resistance of the 800W toaster connected to 90 V 139 Elsi Q 53gtlt104 J 2 E 12X10A8J 27 b The total charge that an automobile battery can supply without being recharged is given in terms of amperehours A typical 12V battery has a rating of 60 amperehours 60 A for 1 h 30 A for 2 h and so on Suppose that you forget to turn the headlights off in your parked automobile If each of the two headlights draws 29 A how long will it be before your battery is quotdeadquot 560 C 3 Q 53gtlt104J 439 11 E 30 KWh b Compared to the primary voltage the secondary voltage can be 1 a water molecule 2 Ll produces a force on the magnet 4 U a magnetic eld b The principal advantage of ac power over dc power is that 2 Ll net charge has been created or destroyed 3 stepdown transformers 4 LJ generator chemica battery b An uncharged pith ball is suspended by a nylon ber When a positivelycharged rubber rod is brought nearby the pith ball 1 direction is changed 3 Ll negatively charged 4 L electric eld b Two charged particles held a certain distance apart are released As they move the acceleration of each decreases Therefore their charges have the same sign or different 1 5 Amps 2 LII energy 4 Ll all the same b If you thrust a magnet into a closed loop of wire the loop will 1 cu rrent 2 LI becomes concentrated 3 Ll an electromagnet b Find the voltage change when the same electric eld does 20 of work on a 000028C charge 1 ill t 10 h 2 have a current in it 3 1 v b Two charged particles repel each other with a force F If the charge of both particles is tripled and the distance between them is also tripled then the force will be 2 I 60 V 3 less F2 The intensity of cosmic rays bombarding the Earth39s surface is most at the 1 Laquot 6 Ohms 3 til series 4 Li motor An electric iron connected to a 110V source draws 80 A of current Find the amount of heat it generates in a minute 3 kg E LZX10A8J 4 E DHNh The end of a compass needle that points to the south pole of a magnet is the 2 letsquot 6Joules 3 U all the same 4 telvohage The principle difference between a stepup and stepdown transformer is 1 til may be de ected or experience a force tr i i l l 3 lcsl neither energy power but voltage 4 led may experience a pair of torques b Two charges separated by one meter exert 1N forces on each other If the charges are pulled 3 meters apart the force on each charge will be 1 L 1 V 2 10 v 4 16 N b The electric eld inside the dome of a Van de Graaff generator depends on what J I ll 391 41 2 58110 053 A 3 led drop it on a hard surface put it in hot ames whack it with a hammer 4 led short range not that strong b An electroscope is charged positively as indicated by foil leaves that stand apart As a negative charge is brought close to the electroscope the leaves become 2 LJ either 3 generator 4 led a water molecule b A stepup transformer steps up voltage by ten times Neglecting slight losses if 100 W of power go into the primary coil the power coming from the secondary coil is 2 Li power 3 F2 4 AC b Which force eld can increase a moving electron39s speed 1 Li electrical 3 lessquot series 4 lessquot magnetic eld b Rub electrons from your hair with a comb and the comb becomes 1 Li loosely bound 3 lessquot equally huge 4 lessquot N 5 electrons b In the atoms of most materials the elds of individual electrons 1 Li cannot 2 lessquot either 4 letsquot all the same
Are you sure you want to buy this material for
You're already Subscribed!
Looks like you've already subscribed to StudySoup, you won't need to purchase another subscription to get this material. To access this material simply click 'View Full Document'