Power in watts is calculated by multiplying voltage by current.

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Multiple Choice

Power in watts is calculated by multiplying voltage by current.

Power is the rate at which energy is transferred. When voltage pushes current through a circuit element, the energy delivered per second equals the product of voltage and current, so power in watts is V times I. For a simple resistive load, this also matches Ohm’s law: P = V*I = V^2/R = I^2*R. In AC systems, the instantaneous power is p(t) = v(t) i(t), and the average real power is P = V_rms I_rms cos(phi); for a purely resistive load, phi is zero and cos(phi) = 1, so P = V_rms I_rms. So the statement is correct in the common contexts used for this material.

Power is the rate at which energy is transferred. When voltage pushes current through a circuit element, the energy delivered per second equals the product of voltage and current, so power in watts is V times I. For a simple resistive load, this also matches Ohm’s law: P = VI = V^2/R = I^2R. In AC systems, the instantaneous power is p(t) = v(t) i(t), and the average real power is P = V_rms I_rms cos(phi); for a purely resistive load, phi is zero and cos(phi) = 1, so P = V_rms I_rms. So the statement is correct in the common contexts used for this material.

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