Electricity and Circuits Quiz

If a wire has a resistance of 8Ω and carries a current of 3A, what is the voltage?

• 11V

• 18V

• 24V

• 32V

A circuit has V=12V and I=4A. What is the resistance?

• 2Ω

• 3Ω

• 4Ω

• 6Ω

If the resistance of a circuit is reduced while voltage remains constant, the current will:

• Decrease

• Increase

• Stay the same

• Become zero

The slope of a V-I graph for an Ohmic conductor represents:

• Current

• Voltage

• Resistance

• Power

If a 20Ω resistor is connected to a 40V battery, what current flows through it?

• 1A

• 1.5A

• 2A

• 2.5A

Which factor increases resistance in a metal conductor?

• Increasing its thickness

• Decreasing its length

• Cooling it

• Heating it

If a conductor obeys Ohm’s Law, which statement is correct?

• Resistance changes with voltage

• Voltage is proportional to current

• Current is proportional to resistance

• Voltage stays constant for all resistances

A 15Ω resistor is connected to a 45V battery. How much current flows?

• 1A

• 2A

• 3A

• 4A

Which device is used to measure current in an electric circuit?

• Voltmeter

• Ammeter

• Ohmmeter

• Wattmeter

A circuit has V=18V and R=9Ω. If the resistance is tripled while voltage stays constant, the new current will be:

• 2A

• 1A

• 0.67A

• 0.5A