Electric Power Quiz

What is the most specific definition of electric power?

• The speed at which electrons move in a circuit.

• The amount of energy stored in a battery.

• The rate at which electrical energy is transferred to a circuit.

• The rate at which work is done.

What is the unit of power and its abbreviation?

• Joule, J

• Watt, W

• Volt, V

• Ampere, A

How much energy does a 2-watt LED light bulb convert per second?

• 2 Joules

• 60 Joules

• 120 Joules

• 900 Joules

Which equation represents the general formula for power?

• Power = Voltage x Current

• Power = Voltage^2 / Resistance

• Power = Work / Time

• Power = Current^2 x Resistance

What is the relationship between power, current, and voltage?

• Power = Voltage / Current

• Power = Current^2 / Voltage

• Power = Current x Voltage

• Power = Voltage^2 x Current

Which equation is derived from Ohm's Law for calculating power?

• Power = Voltage x Current

• Power = Resistance / Current

• Power = Voltage^2 / Resistance

• Power = Current^2 x Resistance

How do you calculate the current if you know the power and voltage?

• Current = Power x Voltage

• Current = Voltage / Power

• Current = Power / Voltage

• Current = Power^2 / Voltage

What is the resistance of a 72-watt light bulb that draws 0.8 amps of current?

• 200 ohms

• 150 ohms

• 90 ohms

• 113 ohms

If a DC traction motor uses 5000 watts of power with a 72-volt source, how much current does it draw?

• 120 amps

• 96 amps

• 69 amps

• 50 amps

Which of the following is NOT a correct equation for calculating electric power?

• Power = Voltage x Current

• Power = Current^2 x Resistance

• Power = Voltage^2 / Resistance

• Power = Voltage / Current