Which statement defines electric power most accurately?

Which statement defines electric power most accurately?

• A. The potential difference between two points
• B. The current flowing through a conductor
• C. The product of current and voltage, representing the rate of energy transfer
• D. The energy per unit charge

Answer: (C)

The idea being tested is how electric power is defined: it’s the rate at which electrical energy is transferred or used in a circuit. This power depends on both how much charge is moving each second (the current) and how much energy each unit of charge carries (the voltage). Multiply them to get the rate of energy transfer: power equals current times voltage. So, if 2 amperes flow through a 5-volt device, the power is 10 watts. The other statements describe voltage alone, current alone, or energy per unit charge, which don’t specify how quickly energy is being transferred.

The idea being tested is how electric power is defined: it’s the rate at which electrical energy is transferred or used in a circuit. This power depends on both how much charge is moving each second (the current) and how much energy each unit of charge carries (the voltage). Multiply them to get the rate of energy transfer: power equals current times voltage. So, if 2 amperes flow through a 5-volt device, the power is 10 watts. The other statements describe voltage alone, current alone, or energy per unit charge, which don’t specify how quickly energy is being transferred.