Current, Voltage, Resistance and Ohm's Law

A circuit contains a 1.5 volt battery and a bulb with a resistance of 3 ohms. Calculate the current.

• 0.5A

• 1A

• 1.5A

• 2A

What current flows through a hair dryer plugged into a 120 Volt circuit if it has a resistance of 25 ohms?

• 2.4A

• 3.6A

• 4.8A

• 6A

If a toaster produces 12 ohms of resistance in a 120-volt circuit, what is the amount of current in the

circuit?

• 5A

• 10A

• 15A

• 20A

A 12 Volt car battery pushes charge through the headlight circuit resistance of 10 ohms. How much current

is passing through the circuit?

• 1A

• 1.2A

• 1.4A

• 1.6A

How much voltage would be necessary to generate 10 amps of current in a circuit that has 5 ohms of

resistance?

• 10V

• 50V

• 100V

• 150V

An electric heater works by passing a current of 100 A though a coiled metal wire, making it red hot. If the

resistance of the wire is 1.1 ohms, what voltage must be applied to it?

• 70V

• 90V

• 110V

• 130V

A light bulb has a resistance of 5 ohms and a maximum current of 10 A. How much voltage can be applied

before the bulb will break?

• 5V

• 10V

• 25V

• 50V

What is the potential difference across an electrical load that has a resistance of 4 Ω and a current of 3 A flowing through it?

• 4V

• 8V

• 12V

• 16V

Calculate the current an electric clothes dryer draws when it is connected to a 230 V source and has a resistance

of 9.2 Ω.

• 5A

• 15A

• 25A

• 35A

A portable radio connected to a 9.0 V battery draws a current of 25 A. What is the resistance of the radio?

• 0.036Ω

• 0.36Ω

• 3.6Ω

• 36Ω