C.13There are three light bulbs in parallel, powered by a single battery. A fourth bulb is added in parallel. (a) What effect does this
have on the three other light bulbs? (b) What effect is there on the battery that is powering the circuit?
(a)
(b)
C.14R 1 and R 2 are identical. At first, the switch is
open. When the switch is closed, what
happens to the power dissipated by R 2? Why?i. It will increase
ii. It will stay the same
iii. It will decrease to a positive value
iv. It will decrease to zeroSection Problems
Section 0 - Introduction
0.1 Leave the simulation in the interactive problem in this section in its initial state to answer the following questions. (a) How
does the potential difference across the battery compare with the potential difference across the light bulb? (b) Is the current
the same everywhere, or does it differ from place to place?(a) They are equal
They are unequal
(b) It is the same everywhere
It differs from place to placeSection 2 - Electromotive force
2.1 A boat's battery has 325 watt-hours of available energy. How many joules of energy will it supply over its lifetime?
J
2.2 A battery has an emf of 7.5 V and 16 A of current flows through it. What power is this battery supplying?
WSection 3 - Energy and electric potential in a circuit
3.1 You have a battery with unusual packaging: It is rated by how much work it does on charge. It says it does 6.6 J of work on
every 2.2 C of charge. What is the emf of this battery?
V
3.2 How much work does a 1.50 V flashlight battery do on an electron as it passes through?
J
3.3 A battery charger is connected to a "dead" battery and causes 4.4 A of current to flow through the battery for 1.5 hours. It
maintains a potential difference of 1.5 V across the terminals of the battery. (a) What is the power the charger delivers? (b)
How much energy does it supply to the battery during the 1.5 hours?
(a) W
(b) J
3.4 There are two light bulbs in a circuit, powered by one battery. One light bulb is a 100 watt light bulb and the other a 200 watt
light bulb. How much power must the battery be supplying for the lights to be running at full power?
W
3.5 A battery in a circuit has an emf of 8.8 V. The only other component in the circuit is a resistor. 4.4 A of current flows in the
circuit. What must the resistance of the resistor be?ȍ
3.6 While the repair shop works on your voltmeter, they loan you an unusual replacement: Rather than measuring the potential
difference across a resistor, it measures the amount of charge that flowed, and the change in electric potential energy of that
charge. You use the device on a resistor and it tells you that 2.5 C of charge flowed through it, and that the electric potential
energy of that charge decreased by 0.40 J. What is the potential difference across the resistor? (Report the answer as a(^500) Copyright 2007 Kinetic Books Co. Chapter 27 Problems