Power in a DC circuit is calculated as P equals

Power in a DC circuit is calculated as P equals

• A. P = V × I.
• B. P = I × R.
• C. P = V / I.
• D. P = R / V.

Answer: (A)

Power in a DC circuit is the rate at which electrical energy is transferred or dissipated, and it’s defined by the product of the driving potential difference (voltage) and the current that flows. So, the power is equal to voltage times current, yielding watts. The other expressions don’t represent power directly: multiplying current by resistance gives a voltage drop, not power; dividing voltage by current gives resistance; and the remaining forms don’t align with the definition of electrical power in terms of energy transfer per unit time. (If you know Ohm’s law, you can also express power as I^2R or V^2/R, but the straightforward form is P = V × I.)

Power in a DC circuit is the rate at which electrical energy is transferred or dissipated, and it’s defined by the product of the driving potential difference (voltage) and the current that flows. So, the power is equal to voltage times current, yielding watts. The other expressions don’t represent power directly: multiplying current by resistance gives a voltage drop, not power; dividing voltage by current gives resistance; and the remaining forms don’t align with the definition of electrical power in terms of energy transfer per unit time. (If you know Ohm’s law, you can also express power as I^2R or V^2/R, but the straightforward form is P = V × I.)