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

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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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