Mon July 09, 2012 By:

An electric iron of resistance 20 ohm takes a current of 50 mA. Calculate the heat developed in 30 sec.

Expert Reply
Tue July 10, 2012
Power consumed by that electric Iron: P= (I2)R
Assuming all the power consumed is turned into heat then heat produced will be: Q = Pt
thus Q = (0.05)(0.05)(20)(30)= 1.5 J
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