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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) 72kJhI had been asked this question in exam.My enquiry is from Energy topic in division Simple DC Networks of Basic Electrical Engineering

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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