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A current of 2 A, passing through a conductor produces 80 J of heat in 10 seconds. The resistance of the conductor in ohm is

1. 0.5
2. 2
3. 4
4. 20

Correct answer: 4

Solution

Using the formula for heat produced, H = I²Rt, where H = 80 J, I = 2 A, and t = 10 s, we solve for R: R = H / (I²t) = 80 / (2² × 10) = 4 Ω.

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