1.

An electric iron of resistance 20 Ω takes a current of 5 A. Calculate the heat developed in 30 s.​

Answer»

Heat = 15000J. Explanation:The amount of heat GENERATED can be CALCULATED using the Joule’s law of heating, which is given by the equation➡ H = I²RTSubstituting the VALUES in the above equation, we get,➡ H = (5)² × 20 × 30➡ H = 15000J. The amount of heat developed by the electric IRON in 30 s is 15000J.



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