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An electric iron of resistance 20 ohm takes a current of 5 A. Calculate the heat developed in 30 s. |
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Answer» Solution :Here, current I = 5 A, resistance R = 20 `Omega`, time t = 30 s Now, HEAT produced `H = I^2Rt` `= (5)^2 xx 20 xx 30` ` = 25 xx 20 xx 30` `= 15000 J` ` =15 kJ` |
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