Which equation expresses electrical power in terms of voltage and current?

Which equation expresses electrical power in terms of voltage and current?

• A. Power
• B. Voltage
• C. Current
• D. Resistance

Answer: (A)

Power in an electrical circuit is the rate at which energy is transferred, and it is found by multiplying the voltage by the current. This gives the equation P = V × I, with power measured in watts. So the correct concept is that power equals voltage times current. For example, at 120 V with a current of 2 A, the power is 240 W. The other options name voltage, current, or resistance themselves, but they do not represent power as a product of voltage and current.

Power in an electrical circuit is the rate at which energy is transferred, and it is found by multiplying the voltage by the current. This gives the equation P = V × I, with power measured in watts. So the correct concept is that power equals voltage times current. For example, at 120 V with a current of 2 A, the power is 240 W. The other options name voltage, current, or resistance themselves, but they do not represent power as a product of voltage and current.