What power in watts is consumed by a 100 ohm resistor connected to 120 VAC?

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Study for the NEIEP Electrical Fundamentals Test. Use flashcards and multiple choice questions, each with hints and explanations. Get ready for your exam!

Multiple Choice

What power in watts is consumed by a 100 ohm resistor connected to 120 VAC?

Explanation:
Power dissipated by a resistor depends on the voltage across it and its resistance (or the current through it). Use P = V^2 / R. With 120 V across 100 Ω, P = 120^2 / 100 = 14,400 / 100 = 144 W. You can also find the current I = V / R = 120 / 100 = 1.2 A, then P = V × I = 120 × 1.2 = 144 W. So the resistor consumes 144 watts.

Power dissipated by a resistor depends on the voltage across it and its resistance (or the current through it). Use P = V^2 / R. With 120 V across 100 Ω, P = 120^2 / 100 = 14,400 / 100 = 144 W. You can also find the current I = V / R = 120 / 100 = 1.2 A, then P = V × I = 120 × 1.2 = 144 W. So the resistor consumes 144 watts.

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