POW: Power, Ohm's, Watt'sLaw Quiz

What is the relationship between power, current, and voltage in an electrical circuit?

• Power depends on current and voltage

• Power depends on current only

• Power depends on voltage only

• Power depends on resistance only

Which law relates power, current, and voltage in an electrical circuit?

• Faraday's Law

• Watt's Law

• Ohm's Law

• Ampere's Law

If the voltage applied to an indicator light is 40V and the resistance of the light is 50Ω, what is the power supplied to the light?

• 32W

• 20W

• 1.6W

• 0.8W

If an indicator light has a resistance of 25Ω and consumes a power of 40W, what is the current flowing in the circuit?

• 0.8A

• 2.0A

• 1.62A

• 1.26A

If a dc power source has a voltage rating of 24V and a current rating of 4A, what is the power rating of the power source?

• 96W

• 6W

• 384W

• 24W

A siren operates at 24 Volts and draws 30mA of current. What is the siren’s resistance?

• 0.8kΩ

• 0.98kΩ

• 0.9kΩ

• 0.96kΩ

The two most important laws of electricity are:

A 120 Volt line is protected with a 15 Amp fuse. Can the fuse carry a 6 Ω load? Why?

• Yes. 120 V divided by 6Ω= is less than 15A, therefore it is protected by the fuse

• Yes. 120 V divided by 6Ω= is greater than 15A, therefore it is protected by the fuse

• No. 120 V divided by 6Ω = is less than 15A, therefore it is NOT protected by the fuse

• No. 120 V divided by 6Ω = is greater than 15A, therefore it is NOT protected by the fuse

A kiln draws 75A from a 480V line.  Calculate the amount of power used.

• 3,600W

• 36kW

• 36W

• 360kW

When a DMM is used to measure resistance it must be placed into the circuit _____ the load that is being tested.

• in series with

• in parallel with

• across

• both in series and parellel is correct

• because parallel means to connect across, both B and C are correct