If the resistance of a circuit is 20 ohms and the current is 15 amps, the power in watts is ___.

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Get ready for the NCCER Introduction to Electrical Circuits exam. Study with multiple choice questions, each question comes with hints and explanations. Ace your exam with confidence!

Multiple Choice

If the resistance of a circuit is 20 ohms and the current is 15 amps, the power in watts is ___.

Explanation:
Power is the rate at which electrical energy is used or transferred. In a circuit, you can calculate it using P = I^2R or P = VI. Since we know the current and the resistance, use P = I^2R. Squaring the current gives 15^2 = 225, then multiply by the resistance: 225 × 20 = 4,500. So the power is 4,500 watts. You can confirm with V = IR = 15 × 20 = 300 V, and P = VI = 300 × 15 = 4,500 W.

Power is the rate at which electrical energy is used or transferred. In a circuit, you can calculate it using P = I^2R or P = VI. Since we know the current and the resistance, use P = I^2R. Squaring the current gives 15^2 = 225, then multiply by the resistance: 225 × 20 = 4,500. So the power is 4,500 watts. You can confirm with V = IR = 15 × 20 = 300 V, and P = VI = 300 × 15 = 4,500 W.

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