 21.1: How many coulombs of charge are in one amperehour?
 21.2: A ashlight bulb carries a current of 0.18 A for 78 s. How much char...
 21.3: The picture tube in a particular television draws a current of 15 A...
 21.4: A car battery does 260 J of work on the charge passing through it a...
 21.5: Highly sensitive ammeters can measure currents as small as 10.0 fA....
 21.6: Atelevision set connected to a 120V outlet consumes 78 W of power....
 21.7: Pacemaker Batteries Pacemakers designed for longterm use commonly e...
 21.8: Aconducting wire is quadrupled in length and tripled in diameter. (...
 21.9: Figure 2126shows a plot of current versus voltage for two different...
 21.10: Predict/Explain Currentversusvoltage plots for two materials, A a...
 21.11: Two cylindrical wires are made of the same material and have the sa...
 21.12: Asilver wire is 5.9 m long and 0.49 mm in diameter. What is its res...
 21.13: When a potential difference of 18 V is applied to a given wire, it ...
 21.14: The tungsten lament of a lightbulb has a resistance of . If the lam...
 21.15: What is the resistance of 6.0 mi of copper wire with a diameter of ...
 21.16: The four conducting cylinders shown in Figure 2127 are all made of ...
 21.17: Abird lands on a bare copper wire carrying a current of 32 A. The w...
 21.18: Acurrent of 0.96 Aows through a copper wire 0.44 mm in diameter whe...
 21.19: Current Through a Cell MembraneAtypical cell membrane is 8.0 nm thi...
 21.20: When a potential difference of 12 V is applied to a wire 6.9 m long...
 21.21: (a)What is the resistance per meter of an aluminum wire with a cros...
 21.22: Resistance and Current in the Human Finger The interior of the huma...
 21.23: Consider a rectangular block of metal of height A, width B, and len...
 21.24: Light A has four times the power rating of light B when operated at...
 21.25: Two lightbulbs operate on the same potential difference. Bulb Ahas ...
 21.26: Two lightbulbs operate on the same current. Bulb A has four times t...
 21.27: A75V generator supplies 3.8 kW of power. How much current does the...
 21.28: Aportable CD player operates with a current of 22 mAat a potential ...
 21.29: Find the power dissipated in a electric heater connected to a 120V...
 21.30: The current in a 120V reading lamp is 2.6 A. If the cost of electr...
 21.31: It costs 2.6 cents to charge a car battery at a voltage of 12 V and...
 21.32: A 75W lightbulb operates on a potential difference of 95 V. Find (...
 21.33: Rating Car Batteries Car batteries are rated by the following two n...
 21.34: Predict/Explain A dozen identical lightbulbs are connected to a giv...
 21.35: Predict/Explain Afuseis a device to protect a circuit from the effe...
 21.36: A circuit consists of three resistors, , connected in series to a b...
 21.37: Predict/Explain Two resistors are connected in parallel. (a) If a t...
 21.38: Find the equivalent resistance between points Aand B for the group ...
 21.39: What is the minimum number of resistors that must be connected in p...
 21.40: Four lightbulbs (A, B, C, D) are connected together in a circuit of...
 21.41: Your toaster has a power cord with a resistance of connected in ser...
 21.42: Ahobbyist building a radio needs a resistor in her circuit, but has...
 21.43: A circuit consists of a 12.0V battery connected to three resistors...
 21.44: Three resistors, , and R, are connected in series with a 24.0V bat...
 21.45: A circuit consists of a battery connected to three resistors ( , an...
 21.46: Three resistors, , and R, are connected in parallel with a 12.0V b...
 21.47: An resistor has a current of 0.72 Aand is connected in series with ...
 21.48: The equivalent resistance between points A and B of the resistors s...
 21.49: Find the equivalent resistance between points A and B shown in Figu...
 21.50: How many 65W lightbulbs can be connected in parallel across a pote...
 21.51: . (a) Find the current owing through the and the resistors. (b) How...
 21.52: A12V battery is connected to terminals Aand B in Figure 2130. (a) ...
 21.53: The terminals Aand B in Figure 2131are connected to a 9.0V battery...
 21.54: Suppose the battery in Figure 2132 has an internal resistance . (a)...
 21.55: The current owing through the resistor in Figure 2133 is 1.52 A. (a...
 21.56: The current in the resistor in Figure 2133 is 0.795 A. Find the cur...
 21.57: Four identical resistors are connected to a battery as shown in Fig...
 21.58: Find the magnitude and direction (clockwise or counterclockwise) of...
 21.59: Suppose the polarity of the 11.5V battery in Figure 2135 is revers...
 21.60: It is given that point A in Figure 2135 is grounded . (a) Is the po...
 21.61: Consider the circuit shown in Figure 2136. Find the current through...
 21.62: Suppose point Ais grounded in Figure 2136. Find the potential at po...
 21.63: (a) Find the current in each resistor in Figure 2137. (b) Is the po...
 21.64: Two batteries and three resistors are connected as shown in Figure ...
 21.65: Two capacitors, and , are connected to a battery. (a) Which capacit...
 21.66: Predict/Explain Two capacitors are connected in series. (a) If a th...
 21.67: Predict/Explain Two capacitors are connected in parallel. (a) If a ...
 21.68: Find the equivalent capacitance between points A and B for the grou...
 21.69: A12V battery is connected to three capacitors in series. The capac...
 21.70: You conduct a series of experiments in which you connect the capaci...
 21.71: Three different circuits, each containing a switch and two capacito...
 21.72: Terminals Aand B in Figure 2139 are connected to a 9.0V battery. F...
 21.73: Two capacitors, one and the other , are connected in parallel acros...
 21.74: Two capacitors, one and the other , are connected in series across ...
 21.75: The equivalent capacitance of the capacitors shown in Figure 2141 i...
 21.76: Two capacitors, and , are connected in series and charged by a batt...
 21.77: With the switch in position A, the capacitor in Figure 2142 is full...
 21.78: The switch on an RC circuit is closed at . Given that , and , how m...
 21.79: The capacitor in an RC circuit is initially uncharged. Find (a) the...
 21.80: Three RC circuits have the emf, resistance, and capacitance given i...
 21.81: Consider an RC circuit with , and . Find (a) the time constant for ...
 21.82: The resistor in an RCcircuit has a resistance of . (a)What capacita...
 21.83: Aash unit for a camera has a capacitance of . What resistance is ne...
 21.84: Figure 2143 shows a simplied circuit for a photographic ash unit. T...
 21.85: Consider the RCcircuit shown in Figure 2144. Find (a)the time const...
 21.86: The capacitor in an RC circuit is initially uncharged. In terms of ...
 21.87: Agiven car battery is rated as 250 amphours. Is this rating a meas...
 21.88: Predict/Explain The resistivity of tungsten increases with temperat...
 21.89: Acylindrical wire is to be doubled in length, but it is desired tha...
 21.90: Predict/Explain An electric space heater has a power rating of 500 ...
 21.91: Two resistors, and , are connected to a battery. (a)Which resistor ...
 21.92: Consider the circuit shown in Figure 2145, in which three lights, e...
 21.93: Predict/Explain (a) Referring to and the circuit in Figure 2145, do...
 21.94: Predict/Explain (a) Referring to and the circuit in Figure 2145, do...
 21.95: Consider the circuit shown in Figure 2146, in which three lights, e...
 21.96: Predict/Explain (a) When the switch is closed in the circuit shown ...
 21.97: Predict/Explain (a) When the switch is closed in the circuit shown ...
 21.98: Suppose that points Aand B in Figure 2130 are connected to a 12V b...
 21.99: You are given resistors of , and . Describe how these resistors mus...
 21.100: You are given capacitors of , and . Describe how these capacitors m...
 21.101: Suppose your car carries a charge of . What current does it produce...
 21.102: The circuit shown in Figure 2147shows a resistor and two capacitors...
 21.103: The three circuits shown in Figure 2148 have identical batteries, r...
 21.104: It is desired to construct a resistor from a 1.2m length of tungst...
 21.105: Electrical Safety Codes For safety reasons, electrical codes have b...
 21.106: A ThreeWay LightbulbAthreeway lightbulb has two laments with resi...
 21.107: Aportable CD player uses a current of 7.5 mAat a potential differen...
 21.108: An electrical heating coil is immersed in 4.6 kg of water at 22 C. ...
 21.109: Consider the circuit shown in Figure 2150.(a)Is the current owing t...
 21.110: Asilver wire and a copper wire have the same volume and the same re...
 21.111: Two resistors are connected in series to a battery with an emf of 1...
 21.112: Pacemaker Pulses A pacemaker sends a pulse to a patients heart ever...
 21.113: A long, thin wire has a resistance R. The wire is now cut into thre...
 21.114: Three resistors are connected to a battery. (a) If the resistors ar...
 21.115: Suppose we connect a 12.0V battery to terminals Aand Bin Figure 21...
 21.116: Suppose the battery in Figure 2150 has an internal resistance of . ...
 21.117: National Electric CodeIn the United States, the National Electric C...
 21.118: A15.0V battery is connected to terminals Aand B in Figure 2141. (a...
 21.119: The switch in the RC circuit shown in Figure 2144 is closed at . (a...
 21.120: Two resistors, and , are connected in parallel and connected to a b...
 21.121: Abattery has an emf and an internal resistance r. When the battery ...
 21.122: When two resistors, and , are connected in series across a 6.0V ba...
 21.123: The circuit shown in Figure 2151 is known as a Wheatstone bridge. F...
 21.124: Suppose the voltmeter measures a potential difference of 3.70 V acr...
 21.125: What is the resistance of the person and footwear when the voltmete...
 21.126: The resistance of a given person and footwear is . What is the read...
 21.127: Suppose that during one test a persons shoes become wet when water ...
 21.128: Referring to Example 217Suppose the three resistors in this circuit...
 21.129: Referring to Example 217 Suppose and . The emf of the battery is 12...
 21.130: Referring to Example 219 Suppose the resistance of the resistor is ...
 21.131: Referring to Example 219 Suppose the capacitance of the capacitor i...
Solutions for Chapter 21: Physics 4th Edition
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ISBN: 9780321611116
Solutions for Chapter 21
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Key Physics Terms and definitions covered in this textbook

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parallel

any symbol
average (indicated by a bar over a symbol—e.g., v¯ is average velocity)

°C
Celsius degree

°F
Fahrenheit degree