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26/09/2021 5:07 pm
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An electric iron of resistance 20 12 takes a current of 5 A. Calculate the heat developed in 30 s.
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26/09/2021 5:07 pm
Heat developed is equal to the work done (W).
Given: R = 20 Ω, I = 5 A and t = 30 s
∴ W = I2Rt = (5)2 x 20 x 30
= 25 x 20 x 30 = 15,000 J
Hence, the heat developed by electric iron is 15,000 J.