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A current of 2A flows in a wire offering a resistance of 10ohm. Calculate the energy dissipated by the wire in 0.5 hours.(a) 72Wh(b) 72kJ(c) 7200J(d) 72kJh |
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Answer» Correct choice is (b) 72kJ Explanation: Here I (current) = 2A and Resistance(R) = 10ohm. Power = I^2R = 2^2*10=40. Energy = Pt = 40*0.5*60*60 = 72000J=72kJ. |
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