Problem 28.1QQ: To maximize the percentage of the power from the emf of a battery that is delivered to a device... Problem 28.2QQ: With the switch in the circuit of Figure 27.4a closed, there is no current in R2 because the current... Problem 28.3QQ: With the switch in the circuit of Figure 27.6a open, there is no current in R2. There is current in... Problem 28.4QQ Problem 28.5QQ: Consider the circuit in Figure 27.17 and assume the battery has no internal resistance. (i) Just... Problem 28.1OQ: Is a circuit breaker wired (a) in series with the device it is protecting, (b) in parallel, or (c)... Problem 28.2OQ: A battery has some internal resistance. (i) Clan the potential difference across the terminals of... Problem 28.3OQ: The terminals of a battery are connected across two resistors in series. The resistances of the... Problem 28.4OQ: When operating on a 120-V circuit, an electric heater receives 1.30 103 W of power, a toaster... Problem 28.5OQ: If the terminals of a battery with zero internal resistance are connected across two identical... Problem 28.6OQ Problem 28.7OQ: What is the time constant of the circuit shown in Figure OQ28.7? Each of the five resistors has... Problem 28.8OQ: When resistors with different resistances are connected in series, which of the following must be... Problem 28.9OQ: When resistors with different resistances are connected in parallel, which of the following must be... Problem 28.10OQ: The terminals of a battery are connected across two resistors in parallel. The resistances of the... Problem 28.11OQ: Are the two headlights of a car wired (a) in series with each other, (b) in parallel, or (c) neither... Problem 28.12OQ: In the circuit shown in Figure OQ28.12, each battery is delivering energy to the circuit by... Problem 28.13OQ Problem 28.14OQ: A circuit consists of three identical lamps connected to a battery as in Figure OQ28.14. The battery... Problem 28.15OQ: A series circuit consists of three identical lamps connected to a battery as shown in Figure... Problem 28.1CQ: Suppose a parachutist lands on a high-voltage wire and grabs the wire as she prepares to be rescued.... Problem 28.2CQ: A student claims that the second of two lightbulbs in series is less bright than the first because... Problem 28.3CQ: Why is ii possible for a bird to sit on a high-voltage wire without being electrocuted? Problem 28.4CQ: Given three lightbulbs and a battery, sketch as many different electric circuits as you can. Problem 28.5CQ Problem 28.6CQ: Referring to Figure CQ28.6, describe what happens to the lightbulb after the switch is closed.... Problem 28.7CQ Problem 28.8CQ: (a) What advantage does 120-V operation offer over 240 V? (b) What disadvantages does it have? Problem 28.9CQ Problem 28.10CQ Problem 28.1P: A battery has an emf of 15.0 V. The terminal voltage of the battery is 11.6 V when it is delivering... Problem 28.2P: Two 1.50-V batterieswith their positive terminals in the same directionare inserted in series into a... Problem 28.3P: An automobile battery has an emf of 12.6 V and 171 .m internal resistance of 0.080 0 . The... Problem 28.4P: As in Example 27.2, consider a power supply with fixed emf and internal resistance r causing... Problem 28.5P: Three 100- resistors are connected as shown in Figure P28.5. The maximum power that can safely be... Problem 28.6P Problem 28.7P: What is the equivalent resistance of the combination of identical resistors between points a and b... Problem 28.8P: Consider the two circuits shown in Figure P27.5 in which the batteries are identical. The resistance... Problem 28.9P: Consider the circuit shown in Figure P28.9. Find (a) the current in the 20.0- resistor and (b) the... Problem 28.10P: (a) You need a 45- resistor, but the stockroom has only 20- and 50- resistors. How can the desired... Problem 28.11P: A battery with = 6.00 V and no internal resistance supplies current to the circuit shown in Figure... Problem 28.12P: A battery with emf and no internal resistance supplies current to the circuit shown in Figure... Problem 28.13P: (a) Kind the equivalent resistance between points a and b in Figure P28.13. (b) Calculate the... Problem 28.14P: (a) When the switch S in the circuit of Figure P28.14 is closed, will the equivalent resistance... Problem 28.15P Problem 28.16P: Four resistors are connected to a battery as shown in Figure P27.15. (a) Determine the potential... Problem 28.17P: Consider die combination of resistors shown in Figure P28.17. (a) Kind die equivalent resistance... Problem 28.18P: For the purpose of measuring the electric resistance of shoes through the body of the wearer... Problem 28.19P: Calculate the power delivered to each resistor in the circuit shown in Figure P27.13. Figure P27.13 Problem 28.20P: Why is the following situation impossible? A technician is testing a circuit that contains a... Problem 28.21P: Consider the circuit shown in Figure P28.21 on page 860. (a) Find the voltage across the 3.00-0... Problem 28.22P: In Figure P28.22, show how to add just enough ammeters to measure every different current. Show how... Problem 28.23P: The circuit shown in Figure P27.17 is connected for 2.00 min. (a) Determine the current in each... Problem 28.24P: For the circuit shown in Figure P28.24, calculate (a) the current in the 2.00-11 resistor and (b)... Problem 28.25P: What are the expected readings of (a) the ideal ammeter and (b) the ideal voltmeter in Figure... Problem 28.26P: The following equations describe an electric circuit:... Problem 28.27P: Taking R = 1.00 k and = 250 V in Figure P27.19, determine the direction and magnitude of the... Problem 28.28P: You have a faculty position at a community college and are m (caching a class in automotive... Problem 28.29P: The ammeter shown in Figure P28.29 reads 2.00 A. Find (a) I1, (b) I2, and (c) . Problem 28.30P: In the circuit of Figure P28.30, determine (a) the current in each resistor and (b) the potential... Problem 28.31P: Using Kirchhoffs rules, (a) find (he current in each resistor shown in Figure P28.51 and (b) find... Problem 28.32P: In the circuit of Figure P27.20, the current I1 = 3.00 A and the values of for the ideal battery... Problem 28.33P: In Figure P28.33, find (a) the current in each resistor and (b) the power delivered to each... Problem 28.34P: For the circuit shown in Figure P27.22, we wish to find the currents I1, I2, and I3. Use Kirchhoffs... Problem 28.35P: Find the potential difference across each resistor in Figure P28.35. Problem 28.36P: (a) Can the circuit shown in Figure P27.21 be reduced to a single resistor connected to a battery?... Problem 28.37P: An uncharged capacitor and a resistor are connected in series to a source of emf. If = 9.00 V, C =... Problem 28.38P: Consider a series RC circuit as in Figure P28.38 for which R = 1.00 M, C = 5.00 F, and = 30.0 V.... Problem 28.39P: A 2.00-nF capacitor with an initial charge of 5.10 C ca is discharged through a 1.30-k resistor. (a)... Problem 28.40P: A 10.0-F capacitor is charged by a 10.0-V battery through a resistance R. The capacitor reaches a... Problem 28.41P: In the circuit of Figure P27.25, the switch S has been open for a long time. It is then suddenly... Problem 28.42P: In the circuit of Figure P27.25, the switch S has been open for a long time. It is then suddenly... Problem 28.43P: The circuit in Figure P28.43 has been connected for a long time. (a) What is the potential... Problem 28.44P: Show that the integral 0e2t/RCdtin Example 27.11 has the 12RC. Problem 28.45P: A charged capacitor is connected to a resistor and switch as in Figure P28.45. The circuit has a... Problem 28.46P Problem 28.47P Problem 28.48P: Turn on your desk lamp. Pick up the cord, with your thumb and index finger spanning the width of the... Problem 28.49AP: Assume you have a battery of emf and three identical lightbulbs, each having constant resistance R.... Problem 28.50AP: Find the equivalent resistance between points a and b in Figure P27.33. Figure P27.33 Problem 28.51AP: Four 1.50-V AA batteries in series are used to power a small radio. II the batteries can move a... Problem 28.52AP: Four resistors are connected in parallel across a 9.20-V battery. They carry currents of 150 mA,... Problem 28.53AP: The circuit in Figure P27.35 has been connected for several seconds. Find the current (a) in the... Problem 28.54AP: The circuit in Figure P27.34a consists of three resistors and one battery with no internal... Problem 28.55AP: For the circuit shown in Figure P28.55. the ideal voltmeter reads 6.00 V and the ideal ammeter reads... Problem 28.56AP: The resistance between terminals a and b in Figure P27.36 is 75.0 . If the resistors labeled R have... Problem 28.57AP: (a) Calculate the potential difference between points a and b in Figure P27.37 and (b) identify... Problem 28.58AP: Why is the following situation impossible? A battery has an emf of = 9.20 V and an internal... Problem 28.59AP: A rechargeable battery has an emf of 13.2 V and an internal resistance of 0.850 . It is charged by a... Problem 28.60AP: Find (a) the equivalent resistance of the circuit in Figure P28.60, (b) the potential difference... Problem 28.61AP: When two unknown resistors are connected in series with a battery, the battery delivers 225 W and... Problem 28.62AP: When two unknown resistors are connected in series with a battery, the battery delivers total power... Problem 28.63AP: The- pair of capacitors in Figure P28.63 are fully charged by a 12.0-V battery. The battery is... Problem 28.64AP: A power supply has an open-circuit voltage of 40.0 V and an internal resistance of 2.00 . It is used... Problem 28.65AP: The circuit in Figure P27.41 contains two resistors, R1 = 2.00 k and R2 = 3.00 k, and two... Problem 28.66AP: Two resistors R1 and R2 are in parallel with each other. Together they carry total current I. (a)... Problem 28.67AP Problem 28.68AP: A battery is used to charge a capacitor through a resistor as shown in Figure P27.44. Show that half... Problem 28.69AP: A young man owns a canister vacuum cleaner marked 535 W [at] 120 V and a Volkswagen Beetle, which he... Problem 28.70AP: (a) Determine the equilibrium charge on the capacitor in the circuit of Figure P27.46 as a function... Problem 28.71AP: Switch S shown in Figure P28.71 has been closed for a long lime, and the electric circuit carries a... Problem 28.72AP: Three identical 60.0-W, 120-V lightbulbs are connected across a 120-V power source as shown in... Problem 28.73AP: A regular tetrahedron is a pyramid with a triangular base and triangular sides as shown in Figure... Problem 28.74AP: An ideal voltmeter connected across a certain fresh 9-V battery reads 9.30 V, and an ideal ammeter... Problem 28.75AP: In Figure P27.47, suppose the switch has been closed for a time interval sufficiently long for the... Problem 28.76AP: Figure P27.48 shows a circuit model for the transmission of an electrical signal such as cable TV to... Problem 28.77AP: The student engineer of a campus radio station wishes to verify the effectiveness of the lightning... Problem 28.78AP: The circuit shown in Figure P28.78 is set up in the laboratory to measure an unknown capacitance C... Problem 28.79AP: An electric teakettle has a multiposition switch and two heating coils. When only one coil is... Problem 28.80AP: A voltage V is applied to a series configuration of n resistors, each of resistance R. The circuit... Problem 28.81AP: In places such as hospital operating rooms or factories for electronic circuit boards, electric... Problem 28.82CP: The switch in Figure P27.51a closes when Vc23Vand opens when Vc13V. The ideal voltmeter reads a... Problem 28.83CP: The resistor R in Figure P28.83 receives 20.0 W of power. Determine the value of R. format_list_bulleted
Physics for Scientists and Engineers with Modern ...PhysicsISBN:9781337553292Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning