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

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#### Solution

The amount of heat (*H*) produced is given by the joule’s law of heating as*H*= Vlt

Where,

Current, *I* = 5 A

Time, *t* = 30 s

Voltage, *V* = Current x Resistance = 5 x 20 = 100 *V*

*H*= 100 x 5 x 30 = 1.5 x 10^{4} J.

Therefore, the amount of heat developed in the electric iron is 1.5 x 10^{4} J.

Concept: Effects of Electric Current - Heating Effect of Electric Current

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