Name __________________________________ Date:___________ Period:______________
Electric Circuits Problems
1. Calculate the power rating of an I-Pod drawing 3.5 A from a 6.0 V battery.
2. A microwave over operating on a 110 V circuit draws 15 A. What is its power rating?
3. What is the current passing through a 12 V circuit on a 9.6 A appliance?
4. Complete the data table by using Ohm’s Law to fill in the missing information.
Current (A)
Voltage (V)
2.5
110
3.0
2.5
Power (W)
11
9.0
25
1200
4.5
22
220
2500
5. A 9 V battery is connected in series with a 10 Ω resistor. What is the current in the circuit?
6. What is the current through a 2.5 ohm resistor that is connected across a 6.0 V potential difference?
7. The light bulb has a resistance of 20 ohms. What current is flowing from the 110-volts? Find the power
output of the bulb also.
8. How many volts are needed for a current of 5 amps and a 50-ohm resistor?
9. The computer has a resistance of 600 ohms. What current is flowing from the 120-volts? Find the power
output also.
10. A circuit contains two 1.5 volt batteries and a bulb with a resistance of 3 ohms. Calculate the current.
11. What is the voltage of a circuit with 15 amps of current and toaster with 8 ohms of resistance?
12. A light bulb has a resistance of 4 ohms and a current of 2 A. What is the voltage across the bulb?
13. How much voltage would be necessary to generate 10 amps of current in a circuit that has 5 ohms of
resistance?
14. How many ohms of resistance must be present in a circuit that has 120 volts and a current of 10 amps?
15. An alarm clock draws 0.5 A of current when connected to a 120 volt circuit. Calculate its resistance.
16. A portable CD player uses two 1.5 V batteries. If the current in the CD player is 2 A, what is its
resistance?
17. You have a large flashlight that takes 4 D-cell batteries. If the current in the flashlight is 2 amps, what is
the resistance of the light bulb? (Hint: One D-cell battery has 1.5 volts.)
18. BONUS: You have four 1.5 V batteries, a 1 ohm bulb, a 2 ohm bulb, and a 3 ohm bulb. Draw a circuit
you could build to create each of the following currents. There may be more than one possible answer
for each.
a.
b.
c.
d.
1 ampere
2 amperes
3 amperes
6 amperes