Electric power is?
Correct answer: A. Rate of electric work done per unit time
- A. Rate of electric work done per unit time
- B. Voltage per unit time
- C. Electric charge per unit time
- D. Current per unit time
Explanation
Electric power is defined as the rate at which work is done or energy is transferred in an electric circuit. It is calculated as the product of voltage and current (P = VI). This makes Option A the correct choice. Option B is incorrect because voltage alone does not define power, as it lacks the current component. Option C incorrectly describes current, which is charge per unit time, not power. Option D is incorrect as it describes a rate of change in current, not power, which is a function of both voltage and current.
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About Current Electricity
Steady current relates charge flow to potential difference, resistance and resistivity, including how temperature changes a conductor's resistance. Sources with internal resistance have terminal voltage below their emf when delivering current, and maximum power output occurs under a specific load condition rather than at zero resistance.
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