Problem 1CQ: Your body is composed of electric charges. Does it follow, then, that you produce an electric... Problem 2CQ: Suppose you charge a comb by rubbing it through the fur on your dogs back. Do you produce a current... Problem 3CQ: An electron moving through a wire has an average drift speed that is very small. Does this mean that... Problem 4CQ: Are car headlights connected in series or parallel? Give an everyday observation that supports your... Problem 5CQ: Is it possible to connect a group of resistors of value R in such a way that the equivalent... Problem 6CQ: What physical quantity do resistors connected in series have in common? Problem 7CQ: What physical quantity do resistors connected in parallel have in common? Problem 8CQ: Explain how electrical devices can begin operating almost immediately after you throw a switch, even... Problem 9CQ: Explain the difference between resistivity and resistance. Problem 10CQ: Explain why birds can roost on high-voltage wires without being electrocuted. Problem 11CQ: Consider the circuit shown in Figure 21-36, in which a light of resistance R and a capacitor of... Problem 1PCE: A flashlight bulb carries a current of 0.38 A for 98 s. How much charge flows through the bulb in... Problem 2PCE: Predict/Calculate A car battery does 360 J of work on the charge passing through it as it starts an... Problem 3PCE: Highly sensitive ammeters can measure currents as small as 10.0 fA. How many electrons per second... Problem 4PCE: A television set connected to a 120-V outlet consumes 21 W of power. (a) How much current flows... Problem 5PCE: BIO Pacemaker Batteries Pacemakers designed for long-term use commonly employ a lithium-iodine... Problem 6PCE: A conducting wire is quadrupled in length and tripled in diameter. (a) Does its resistance increase,... Problem 7PCE: Figure 21-37 shows a plot of current versus voltage for two different materials, A and B. Which of... Problem 8PCE: Predict/Explain Current-versus-voltage plots for two materials, A and B, are shown in Figure 21-37.... Problem 9PCE Problem 10PCE: When a potential difference of 12 V is applied to a given wire, it conducts 0.45 A of current. What... Problem 11PCE Problem 12PCE Problem 13PCE: Transcranial Direct-Current Stimulation In a tDCS treatment procedure, 0.85 mA of current flows... Problem 14PCE: The four conducting cylinders shown in Figure 21-38 are all made of the same material, though they... Problem 15PCE: Predict/Calculate A bird lands on a bare copper wire carrying a current of 32 A. The wire is 6... Problem 16PCE Problem 17PCE: Predict/Calculate BIO Current Through a Cell Membrane A typical cell membrane is 8.0 nm thick and... Problem 18PCE Problem 19PCE Problem 20PCE: BIO Resistance and Current in the Human Finger The interior of the human body has an electrical... Problem 21PCE: If a potential difference V is maintained between the two A B faces of the block, a current IAB is... Problem 22PCE: Light A has four times the power rating of light B when operated at the same voltage. (a) Is the... Problem 23PCE: Two lightbulbs operate on the same potential difference. Bulb A has four times the power output of... Problem 24PCE: Problems and Conceptual Exercises Section 21-3 Energy and Power in Electric Circuits 24. CE Two... Problem 25PCE: A 65-V generator supplies 4.8 kW of power. How much current does the generator produce? Problem 26PCE: A portable CD player operates with a current of 18 mA at a potential difference of 4.3 V. What is... Problem 27PCE: Find the power dissipated in a 22- electric heater connected to a 120-V outlet. Problem 28PCE: The current in a 120-V reading lamp is 2.6 A. If the cost of electrical energy is 0.075 per... Problem 29PCE: Circuit A in a house has a voltage of 208 V and is limited by a 40.0-A circuit breaker. Circuit B is... Problem 30PCE: Predict/Calculate A 65-W lightbulb operates on a potential difference of 95 V. Find (a) the current... Problem 31PCE: Rating Car Batteries Car batteries are rated by the following two numbers: (1) cranking amps =... Problem 32PCE: Predict/Explain A dozen identical lightbulbs are connected to a given emf. (a) Will the lights be... Problem 33PCE: A circuit consists of three resistors, R1 R2 R3, connected in series to a battery. Rank these... Problem 34PCE: Predict/Explain Two resistors are connected in parallel. (a) If a third resistor is now connected in... Problem 35PCE: What is the minimum number of 88- resistors that must be connected in parallel to produce an... Problem 36PCE: Find the equivalent resistance between points A and B for the group of resistors shown in Figure... Problem 37PCE: A 9.00-V battery is connected across the terminals A and B for the group of resistors shown in... Problem 38PCE: Holiday Lights In a string of holiday lights, 50 lightswith a resistance of 13.5 eachare connected... Problem 39PCE: Your toaster has a power cord with a resistance of 0.020 connected in series with a 9.6- nichrome... Problem 40PCE Problem 41PCE: Predict/Calculate Three resistors, 11, 53 , and R, are connected in series with a 24.0-V battery.... Problem 42PCE: A circuit consists of a battery connected to three resistors (65, 25 , and 170 ) in parallel. The... Problem 43PCE: Predict/Calculate Three resistors, 22 , 67 , and R, are connected in parallel with a 12.0-V battery.... Problem 44PCE Problem 45PCE: The equivalent resistance between points A and B of the resistors shown in Figure 21-41 is 33 . Find... Problem 46PCE: Find the equivalent resistance between points A and B shown in Figure 21-42. Figure 21-42 Problem 47PCE: How many 23-W lightbulbs can be connected in parallel across a potential difference of 92 V before... Problem 48PCE: The circuit in Figure 21-43 includes a battery with a finite internal resistance, r = 0.50 . (a)... Problem 49PCE: Predict/Calculate A 12-V battery is connected to terminals A and B in Figure 21-41. (a) Given that R... Problem 50PCE: Predict/Calculate The terminals A and B in Figure 21-42 are connected to a 9.0-V battery. (a) Find... Problem 51PCE: Predict/Calculate Suppose the battery in Figure 21-43 has an internal resistance r = 0.25 . (a) How... Problem 52PCE: Predict/Calculate The current flowing through the 8.45- resistor in Figure 21-44 is 1.52 A. (a) What... Problem 53PCE: Predict/Calculate Four identical resistors are connected to a battery as shown in Figure 21-45. When... Problem 54PCE: Find the magnitude and direction (clockwise or counterclockwise) of the current in Figure 21-46 Problem 55PCE: Predict/Calculate Suppose the polarity of the 11.5-V battery in Figure 21-46 is reversed. (a) Do you... Problem 56PCE: Predict/Calculate It is given that point A in Figure 21-46 is grounded (V = 0). (a) Is the potential... Problem 57PCE: Consider the circuit shown in Figure 21-47. Find the current through each resistor using (a) the... Problem 58PCE: Suppose point A is grounded (V = 0) in Figure 21-47. Find the potential at points B and C. Problem 59PCE: Predict/Calculate (a) Find the current in each resistor in Figure 21-48. (b) Is the potential at... Problem 60PCE: Two batteries and three resistors are connected as shown in Figure 21-49. How much current flows... Problem 61PCE: Two capacitors, C1 = C and C2 = 2C, are connected to a battery. (a) Which capacitor stores more... Problem 62PCE: Predict/Explain Two capacitors are connected in series. (a) If a third capacitor is now connected in... Problem 63PCE: Predict/Explain Two capacitors are connected in parallel. (a) If a third capacitor is now connected... Problem 64PCE: A 252-F capacitor is connected in series with a 126-F capacitor. What is the equivalent capacitance... Problem 65PCE: A 36-F capacitor is connected in parallel with an 18-F capacitor. What is the equivalent capacitance... Problem 66PCE: Find the equivalent capacitance between points A and B for the group of capacitors shown in Figure... Problem 67PCE: A 15-V battery is connected to three capacitors in series. The capacitors have the following... Problem 68PCE: Three different circuits, each containing a switch and two capacitors, are shown in Figure 21-51.... Problem 69PCE: Terminals A and B in Figure 21-50 are connected to an 18-V battery. Find the energy stored in each... Problem 70PCE: Predict/Calculate You would like to add a second capacitor to a 24-F capacitor to obtain an... Problem 71PCE: Two capacitors, one 7.5 F and the other 15 F, are connected in parallel across a 15-V battery. (a)... Problem 72PCE: The equivalent capacitance of the capacitors shown in Figure 21-52 is 12.4 F. Find the value of... Problem 73PCE: With the switch in position A, the 11.2-F capacitor in Figure 21-53 is fully charged by the 12.0-V... Problem 74PCE: The switch on an RC circuit is closed at t = 0. Given that = 6.0 V, R = 92 , and C = 28 F, how much... Problem 75PCE: The capacitor in an RC circuit (R = 120 , C = 45 F) is initially uncharged. Find (a) the charge on... Problem 76PCE: Three RC circuits have the emf, resistance, and capacitance given in the accompanying table.... Problem 77PCE: Consider an RC circuit with = 12.0 V, R = 195 , and C = 45.7 F. Find (a) the time constant for the... Problem 78PCE: The resistor in an RC circuit has a resistance of 125 . (a) What capacitance must be used in this... Problem 79PCE: A flash unit for a camera has a capacitance of 1500 F. What resistance is needed in this RC circuit... Problem 80PCE: Figure 21-54 shows a simplified circuit for a photographic flash unit. This circuit consists of a... Problem 81PCE: Nerve Impulse Propagation The speed with which nerve impulses travel is determined in large part by... Problem 82PCE: Predict/Calculate Consider the RC circuit shown in Figure 21-55. Find (a) the time constant and (b)... Problem 83GP: CE Consider the circuit shown in Figure 21-56, in which three lights, each with a resistance R, are... Problem 84GP: CE Predict/Explain (a) Referring to Problem 83 and the circuit in Figure 21-56, does the current... Problem 85GP: CE Consider the circuit shown in Figure 21-57, in which three lights, each with a resistance R, are... Problem 86GP: CE Predict/Explain (a) When the switch is closed in the circuit shown in Figure 21-57, does the... Problem 87GP: Suppose that points A and B in Figure 21-41 are connected to a 12-V battery. Find the power... Problem 88GP: CE The circuit shown in Figure 21-58 shows a resistor and two capacitors connected in series with a... Problem 89GP: CE The three circuits shown in Figure 21-59 have identical batteries, resistors, and capacitors.... Problem 90GP: Electrical Safety Codes For safety reasons, electrical codes have been established that limit the... Problem 91GP: A portable CD player uses a current of 7.5 mA at a potential difference of 3.5 V. (a) How much... Problem 92GP: An electrical heating coil is immersed in 6.6 kg of water at 22 C. The coil, which has a resistance... Problem 93GP: Predict/Calculate Consider the circuit shown in Figure 21-60. (a) Is the current flowing through the... Problem 94GP Problem 95GP: BIO Pacemaker Pulses A pacemaker sends a pulse to a patients heart every time the capacitor in the... Problem 96GP: Three resistors (R,12R,2R) are connected to a battery. (a) If the resistors are connected in series,... Problem 97GP: Predict/Calculate Suppose we connect a 12.0-V battery to terminals A and B in Figure 21-40. (a) Is... Problem 98GP: National Electric Code In the United States, the National Electric Code sets standards for maximum... Problem 99GP: Solar Panel Power The current-versus-voltage plot for a solar panel is shown in Figure 21-61. (a)... Problem 100GP: Predict/Calculate A 15.0-V battery is connected to terminals A and B in Figure 21-52. (a) Given that... Problem 101GP: When two resistors, R1 and R2, are connected in series across a 6.0-V battery, the potential... Problem 102GP: The circuit shown in Figure 21-62 is known as a Wheatstone bridge. Find the value of the resistor R... Problem 103PP: BIO Footwear Safety The American National Standards Institute (ANSI) specifies safety standards for... Problem 104PP: BIO Footwear Safety The American National Standards Institute (ANSI) specifies safety standards for... Problem 105PP: BIO Footwear Safety The American National Standards Institute (ANSI) specifies safety standards for... Problem 106PP: The standard specifies that footwear should be tested three times: with the person standing on only... Problem 107PP: Referring to Example 21-13 Suppose the three resistors in this circuit have the values R1 = 100.0 ,... Problem 108PP: Referring to Example 21-13 Suppose R1 = R2 = 225 and R3 = R. The emf of the battery is 12.0 V. (The... Problem 109PP: Predict/Calculate Referring to Example 21-18 Suppose the resistance of the 126- resistor is reduced... Problem 110PP: Predict/Calculate Referring to Example 21-18 Suppose the capacitance of the 182-F capacitor is... format_list_bulleted