Question

An electricity iron of resistance 20ii taken a cucurrent of 5a calculate heat developed in 30 s

Answer 1

H= I^2RT

H=25×20×30

H=15000 J

Answer 2

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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 = 100V

H= 100 x 5 x 30 = 1.5 x 104 J.

Therefore, the amount of heat developed in the electric iron is 1.5 x 104 J.