The product of electromotive force (volts) and current (amperes) represents the rate of work. What is the unit of this quantity?

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Multiple Choice

The product of electromotive force (volts) and current (amperes) represents the rate of work. What is the unit of this quantity?

Explanation:
Power is the rate at which electrical energy is delivered or work is done. It comes from multiplying the potential difference by the current: P = V × I. Voltage is measured in joules per coulomb and current in coulombs per second, so V × I equals (J/C) × (C/s) = J/s, which is a watt. Therefore, the unit describing this rate of work is the watt. The other terms aren’t this quantity: resistance is a measure of how much a component resists current ( volts per ampere ), and impedance is the total opposition to current in AC including phase effects; neither directly represents power in this simple product.

Power is the rate at which electrical energy is delivered or work is done. It comes from multiplying the potential difference by the current: P = V × I. Voltage is measured in joules per coulomb and current in coulombs per second, so V × I equals (J/C) × (C/s) = J/s, which is a watt. Therefore, the unit describing this rate of work is the watt. The other terms aren’t this quantity: resistance is a measure of how much a component resists current ( volts per ampere ), and impedance is the total opposition to current in AC including phase effects; neither directly represents power in this simple product.

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