Physics Review Problems
Chapters 22-23
3/3/2015
1. When an 8-V battery is connected to a resistor, 2 A of current flows in the
resistor. What is the resistor's value?
2. A battery does 18 J of work on 10 coulombs of charge. What voltage does the
battery supply?
3. What is the power dissipated by a toaster that has a resistance of 40 ohms and is
plugged into a 120-V outlet?
4. A certain bulb with a resistance of 240 ohms is labeled 60 W. For what voltage
circuit was this bulb designed?
5. 100,000 electrons are removed from a neutral plastic ball. What is its charge?
Physics Review Problems
Chapters 22-23
3/3/2015
6. 100 electrons are added to a neutral plastic ball. What is its charge?
7. What is the magnitude of the force on an electron in an electric field of 400 N/C?
8. How much power is used by a 12.0-V car battery that draws 0.5 A of current?
9. A 60-W light bulb and a 100-W light bulb are each connected to separate 120-V
outlets. Compute current for each case. Which light bulb has more current in it?
10. A 2-C charge and a 4-C charge attract each other with 10 N of force. How much
will a 2-C charge and a 12-C charge attract each other when placed the same
distance apart?
Physics Review Problems
Chapters 22-23
3/3/2015
11. Compute the total resistance of a 6-ohm resistor and a 12-ohm resistor connected
in series.
12. Draw a schematic diagram of two 3-ohm resistors in series with a 9-V battery on
one branch of a circuit which “turns the corner” and leads to a split featuring two
6-ohm resistors in parallel with each other, which then rejoins the battery. What
is the overall resistance of the 4 resistors? What is the current through and
voltage across each resistor?
13. 5 amps of current flow through in an electrical device. The voltage across this
device is 190 V. What is the power output of this device?
Physics Review Problems
Chapters 22-23
3/3/2015
14. What is the equivalent resistance of a 30-ohm and a 20-ohm resistor connected in
parallel?
15. A 30-V potential difference is applied across a series combination of an 8.0-ohm
resistor and a 3.0-ohm resistor. What is the current in the 8.0-ohm resistor?
16. A 20.0-V potential difference is applied across a parallel combination of a 60.0ohm and a 10.0-ohm resistor. What is the current in the 10.0-ohm resistor?
17. A 2.0-ohm resistor is connected in series with a 20.0-V battery and a three-branch
parallel network with branches whose resistances are 6.0 ohms each. Ignoring the
battery's internal resistance, what is the current in the battery?