College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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To maximize the percentage of the power from the emf of a battery that is delivered to a device external to the battery, what should the internal resistance of the battery be? (a) It should be as low as possible. (b) It should be as high as possible. (c) The percentage does not depend on the internal resistance.
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- Problem 3: Which one of the following circuits has the largest resistance? Why? E (b) (c) 10 A 40 A 10 A 2 V 8 V 10 V (d) (e) 75 A 5 A 15 V 20 Varrow_forwardA 15 μF capacitor initially charged to 25 μC is discharged through a 1.2 kΩ resistor. How long does it take to reduce the capacitor's charge to 10 μC?arrow_forward> Lightbulb A is marked "60.0 W 120 V," and lightbulb B is marked "100 W 120 V." These labels mean that each lightbulb has its respective power delivered to it when it is connected to a constant 120-V source. (a) Find the resistance of each lightbulb. Ω RA RB Ω = (b) During what time interval does 1.20 C pass into lightbulb A? S (c) Is this charge different upon its exit versus its entry into the lightbulb? Yes No Explain. This answer has not been graded yet. (d) In what time interval does 1.40 J pass into lightbulb A? S (e) By what mechanisms does this energy enter and exit the lightbulb? Explain. This answer has not been graded yet. (f) Find the cost of running lightbulb A continuously for 30.0 days, assuming the electric company sells its product at $0.110 per kWh. (arrow_forward
- Consider the network of four resistors shown in the diagram, where R1 = 1 Ω, R2 = 5 Ω, R3 =2Ω,andR4 =6Ω. . The resistors are connected to a battery with an emf V. (a) What is the current flowing out of the battery if the emf is 12 V? (B) What is the voltage difference across the resistor R1? (C) What is the rate of Ohmic dissipation for resistor R2?arrow_forwardConsider the circuit shown that has two resistors (each with resistance R = 8.00 Q), a battery with negligible internal resistance (V= 12.0 V), and a lightbulb. If the resistance of the lightbulb is 3.50 Q, calculate the power output of the lightbulb (ie. the rate at which energy is dissipated in the lightbulb). R R 12 W 2.2 W 6.8 W 4.0 Warrow_forwardThree resistors are connected to a 4-V battery, 10,25,20. The internal resistance of the battery is negligible. (a) What is the current through the 15-Ω resistance? A(b) Does this same current flow through the 25-Ω resistance? YesNo (c) What is the voltage difference across the 20-Ω resistance? Varrow_forward
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