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NASA-Threads
Electricity and Magnetism
Lesson 32: Electrical Power
Ohm’s Law
Here we have for you some extra problems using all of the equations you have been
introduced to so far. All units for the answers are kept in Amps, Ohms, or Watts.
1/ 3 V is applied across a 6 ohm resistor. What is the power?
2/ A 1.2 ohm resistor passes a current of .2 A. What is the voltage across it?
3/ What is the voltage of a circuit with a resistance of 250 ohms and a current of 0.95
amps?
4/ A small electrical pump is labeled with a rating of 3 amps and a resistance of 40 ohms.
How much power does it have?
5/ A nine volt battery is hooked up to a light bulb with a rating of three ohms. How much
current passes through the light?
6/ A lamp is plugged into the wall outlet, which is providing 110 volts. An ammeter
attached to the lamp shows 2 amps flowing through the circuit. How much power does it
have?
7/ If your skin has a resistance of 100,000 ohms, and you touch a 9-volt battery, what
current will flow through you?
NASA-Threads
Electricity and Magnetism
Lesson 32: Electrical Power
8/ What will be the potential difference across a 50Ω resistor if a current of 500mA is
flowing through it?
9/ How much power will be needed to produce a voltage of 5V cross a 12kΩ resistor?
10/ What value of resistor will be needed to produce a current of 100mA when a voltage of
12V is applied across the resistor?
11/ What voltage will be developed across a 560Ω resistor if a current of 20mA is flowing
through it?
12/ What current passing through 10kΩ resistor will produce a voltage of 8V cross it?