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An electric iron of resistance 20 W takes a current of 5 A. Calculate the heat developed in 30 s.
Here,
I = 5 A, R = 20 W, t = 30s
From formula
H = I2Rt
= 5 × 5 × 20 × 30
= 15000 J
= 15 KJ
Heat = 15 KJ
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