How much power is dissipated in a 10 ohm resistor carrying 2 amperes?
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Correct answer to question 13 (Electronics Information): 40 watts
Method
With current and resistance known, power equals current squared times resistance: 2 squared is 4, and 4 x 10 = 40 watts. Multiplying current by resistance without squaring gives 20, which is actually the voltage across the resistor.
Updated: November 2026
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