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UA / Public Health / PH 102 / What is electric charge and electric field?

What is electric charge and electric field?

What is electric charge and electric field?

Description

School: University of Alabama - Tuscaloosa
Department: Public Health
Course: General Physics II
Professor: Patrick toale
Term: Spring 2017
Tags: Physics
Cost: 50
Name: PH 102 Test 1 Study Guide
Description: This study guide provides a basic summary of each chapter that will be covered on the first test (Chapters 16 through 19) with key formulas that should be added to formula sheet.
Uploaded: 02/14/2017
14 Pages 20 Views 3 Unlocks
Reviews


* Test I Study Guide (Ch.16-19) *


What is electric charge and electric field?



Ch.16: Electric Charge & Electric Field

Insulator VS. charges can't move ex. Wood, plastic

Conductor charges can move around ex. metal

Electric charges : OPPOSITES ATTRACT symbol:Q ♡ ♡ © ° OO 000 unit coulomb (C) elementary charge: e = 1.6022* 10-19 C


What number represents the letter k?



Don't forget about the age old question of How does immigration affect identity?

(proton: te charge; electron: -e charge)

Coulomb's aw F=k K= 8.988*109 N.m/c2 *another way to write k: 60 - ATTK *remember: use VECTOR sums superposition Fiz - F2, blc of Newton's 3rd Law ( = & opposite)


Why are electric field lines important?



T NEM

Force acting on a small + test Electric Field

charge by its charge * also can be written: E-KQ or Esate a unit: Newtons/coulomb (NIC) Don't forget about the age old question of Conspiracy theories mean what?

F $ É point in same direction o charge : moves radially away o charge: moves radially inward We also discuss several other topics like What is the content of thompson’s thought experiments?
Don't forget about the age old question of What is the definition of biological anthropology?

S

Electric Field Lines

tangent to field line originate on a charge < endono charge dense-Strong & lines never cross

A parallel Plates e at Uniform Field E-ma a=

& conductors 0 Any net charge -distributed on surface of conductor 2 E outside of conductor: perpendicular to surface

Gauss's law De = EACOSO unit: Nom?

csum

electric flux L LE, DA, COSO, + E2 AA 2 Cose, t... *only need NET

PE = Qenclosed = 4tTr?E= q CHARGE to find Don't forget about the age old question of What is the nature of dominant-minority group relations?

to

to NET FLUX spherical symmetry Qenci = Q outside Qenci - 0 inside

PS

Ch.17: Electric Potential

Electric Potential Energy

W=Fd = a Ed PEb-PEQ=-q Ed

Electric Potential aka potential Difference (V) Vba = V6-Vă - APEva APE=20V If you want to learn more check out What are the four dimensions of the american dream?

scalar unit: volt? (V) 1V=ITIC for uniform field: AV= - Ed E= -A

Potential Due to a point charge V=K potential near: large $Đ potential far: small to

25V

"npa OV 20V isv JOV 5V

Equipotential Lines: I to electric field

potential- not changing along lines Electric Dipole V=kQl cos o dipole moment: V=Kpcose p-dipole moment midline = 0 potential closer to = V closer to © - V

Capacitance Q-CV C- unit: farad capacitor : used to store electric energy (F) battery: maintains constant pot. diff. IF=1/v

re

Parallel Plate capacitor

& = Q/A

VE Ed=Qd

ERA

EO - area of either plate

C=Q/

trin insulating material placed between plater to

mert capacitance v net electric field |C= K to Alld or C-E Ald 6=KEO

dielectric constant

permittivity

ii energy stored in a capacitor; related to chergy Density.amt. of work done in charging capacitor

· average work done: W=QV Tallenerowo

energy stored in charged capacitor : PE = Q V=CV? - Vi energy stored in electric field of capacitor: PE=EAd. energy density lenergy per volume) : 0

. u=PE VEE

Ad

= ZE E

Ch.18: Electric currents

AL

Current I-AQ unit: Ampere (A)

1A=ICIS high potential 7 low potential terminal 0 Ohm's Law V-IR (true unless specified false)

Resistance R = VI unit: ohms (12) R = VA a R = less current VR-more current

Mirelates propertier of a material to the resistance Kesistivity: Of a device made of that material (P)

R - Pya Punit: sim #look up intable Pr - Po [lta (T-T.)] di temperature coefficient from table Rs = Ro[1 + a (T-To)] Power P-IV P= IPR unit: Watt (w)

Alternating Current V= Vo sin 277ft- Vosin wt Voepeak voltage I- Io sin wt Icepeak current

Irms = 10/2 rms

? Irms = Vrms /R Vems Irms = ľ

avamge

Vrms

rms

average

power

Ch.19: DC Circuits EMF(E) Vab= € -Irk internet resistance I- €

Ror

www

Resistors in serie end to end . LHE

·current = (same I) - Vi=IR, V2=IR2 etc. V=V, + V2 + V3

· V across all 3 (sum) = Voltage of battery Rea - R,+ R2 + Rz tequivalent circuit

I miei Resistors in Parallel

Linkz potential diff. = (same V)

het hom I, = V/R, I2 = V/R2 etc.

tr

·current of all 3 (sum) = current from battery

I= Ii+ Iz+Iz Rea =

I t i ti t for equivalent

R + R + R3 -

circuit

VV

Kirchhoff's Rules - Loop Rule: Energy = I, 12, + I 2 Zz

· Junction Rule : I, - IĄ + Iz

volts junction must = volts leaving innction

-

I capacitors in parallel.

Q, = C,V Q2 = C2 V potential diff. = (same V) charges (Q) sum Q=Q, + Qz.

Ceq = C, + C2 tequivamente

idrsal

Capacitors in Series V, = 0/C, V2 = 9/C2

charge = (same Q) ?

· potentials sum V-V; + V2

D E for equivalent circuit

Et cz

Switch

between

RC Circuits € - Ve+ VC Ve=IR V=Q/C &=I2+O/C {at tao Vc=0 & = VR I = Ele}

I = €/R-RC Q QT » I v - Charging slower Ite e trec Ve = E(1-e *rec) Ve=&et/ec

Tc = RC a time constant tan

TR or 1 C longer time to charge capacitor Discharging: Ve-Vie HRc Q- Qoe tyre

* Test I Study Guide (Ch.16-19) *

Ch.16: Electric Charge & Electric Field

Insulator VS. charges can't move ex. Wood, plastic

Conductor charges can move around ex. metal

Electric charges : OPPOSITES ATTRACT symbol:Q ♡ ♡ © ° OO 000 unit coulomb (C) elementary charge: e = 1.6022* 10-19 C

(proton: te charge; electron: -e charge)

Coulomb's aw F=k K= 8.988*109 N.m/c2 *another way to write k: 60 - ATTK *remember: use VECTOR sums superposition Fiz - F2, blc of Newton's 3rd Law ( = & opposite)

T NEM

Force acting on a small + test Electric Field

charge by its charge * also can be written: E-KQ or Esate a unit: Newtons/coulomb (NIC)

F $ É point in same direction o charge : moves radially away o charge: moves radially inward

S

Electric Field Lines

tangent to field line originate on a charge < endono charge dense-Strong & lines never cross

A parallel Plates e at Uniform Field E-ma a=

& conductors 0 Any net charge -distributed on surface of conductor 2 E outside of conductor: perpendicular to surface

Gauss's law De = EACOSO unit: Nom?

csum

electric flux L LE, DA, COSO, + E2 AA 2 Cose, t... *only need NET

PE = Qenclosed = 4tTr?E= q CHARGE to find

to

to NET FLUX spherical symmetry Qenci = Q outside Qenci - 0 inside

PS

Ch.17: Electric Potential

Electric Potential Energy

W=Fd = a Ed PEb-PEQ=-q Ed

Electric Potential aka potential Difference (V) Vba = V6-Vă - APEva APE=20V

scalar unit: volt? (V) 1V=ITIC for uniform field: AV= - Ed E= -A

Potential Due to a point charge V=K potential near: large $Đ potential far: small to

25V

"npa OV 20V isv JOV 5V

Equipotential Lines: I to electric field

potential- not changing along lines Electric Dipole V=kQl cos o dipole moment: V=Kpcose p-dipole moment midline = 0 potential closer to = V closer to © - V

Capacitance Q-CV C- unit: farad capacitor : used to store electric energy (F) battery: maintains constant pot. diff. IF=1/v

re

Parallel Plate capacitor

& = Q/A

VE Ed=Qd

ERA

EO - area of either plate

C=Q/

trin insulating material placed between plater to

mert capacitance v net electric field |C= K to Alld or C-E Ald 6=KEO

dielectric constant

permittivity

ii energy stored in a capacitor; related to chergy Density.amt. of work done in charging capacitor

· average work done: W=QV Tallenerowo

energy stored in charged capacitor : PE = Q V=CV? - Vi energy stored in electric field of capacitor: PE=EAd. energy density lenergy per volume) : 0

. u=PE VEE

Ad

= ZE E

Ch.18: Electric currents

AL

Current I-AQ unit: Ampere (A)

1A=ICIS high potential 7 low potential terminal 0 Ohm's Law V-IR (true unless specified false)

Resistance R = VI unit: ohms (12) R = VA a R = less current VR-more current

Mirelates propertier of a material to the resistance Kesistivity: Of a device made of that material (P)

R - Pya Punit: sim #look up intable Pr - Po [lta (T-T.)] di temperature coefficient from table Rs = Ro[1 + a (T-To)] Power P-IV P= IPR unit: Watt (w)

Alternating Current V= Vo sin 277ft- Vosin wt Voepeak voltage I- Io sin wt Icepeak current

Irms = 10/2 rms

? Irms = Vrms /R Vems Irms = ľ

avamge

Vrms

rms

average

power

Ch.19: DC Circuits EMF(E) Vab= € -Irk internet resistance I- €

Ror

www

Resistors in serie end to end . LHE

·current = (same I) - Vi=IR, V2=IR2 etc. V=V, + V2 + V3

· V across all 3 (sum) = Voltage of battery Rea - R,+ R2 + Rz tequivalent circuit

I miei Resistors in Parallel

Linkz potential diff. = (same V)

het hom I, = V/R, I2 = V/R2 etc.

tr

·current of all 3 (sum) = current from battery

I= Ii+ Iz+Iz Rea =

I t i ti t for equivalent

R + R + R3 -

circuit

VV

Kirchhoff's Rules - Loop Rule: Energy = I, 12, + I 2 Zz

· Junction Rule : I, - IĄ + Iz

volts junction must = volts leaving innction

-

I capacitors in parallel.

Q, = C,V Q2 = C2 V potential diff. = (same V) charges (Q) sum Q=Q, + Qz.

Ceq = C, + C2 tequivamente

idrsal

Capacitors in Series V, = 0/C, V2 = 9/C2

charge = (same Q) ?

· potentials sum V-V; + V2

D E for equivalent circuit

Et cz

Switch

between

RC Circuits € - Ve+ VC Ve=IR V=Q/C &=I2+O/C {at tao Vc=0 & = VR I = Ele}

I = €/R-RC Q QT » I v - Charging slower Ite e trec Ve = E(1-e *rec) Ve=&et/ec

Tc = RC a time constant tan

TR or 1 C longer time to charge capacitor Discharging: Ve-Vie HRc Q- Qoe tyre

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