Electric Power & Energy

Multiple Choice

Electric power is the rate at which electrical energy is converted to which of the following forms?

• Heat, light, chemical, or mechanical energy

• Only heat energy

• Only light energy

• Only mechanical energy

Multiple Choice

Which equation correctly represents the relationship between electric power, current, and voltage?

• P = IV

• P = I^2R

• P = V/R

• P = IR

Multiple Choice

If a 110 V power source delivers 5 A of current to an electric toaster, what is the power produced by the toaster?

• 550 W

• 220 W

• 605 W

• 115 W

Multiple Select

Which of the following statements are true about the equation P = I^2R?

• It describes the power dissipated in a resistor.

• It involves current and resistance.

• It is derived from Ohm's Law.

• It calculates the voltage across a resistor.

Multiple Choice

If a 110 V power source delivers 5 A of current to an electric toaster, how much energy does it consume in 40 minutes?

• 1320000 J

• 550 J

• 22000 J

• 110 J

Multiple Choice

Based on the electric bill shown, what unit is used to measure electricity consumption for billing purposes?

• kWh

• Joules

• Watts

• Amperes