3(e)
Calculate the quantity of heat produced in a 20 Ω resistor carrying 2.5 A current in 5 minutes.
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Given, R = 20 Ω, I = 2.5 A, t = 5 min = 5 x 60 = 300 s
From relation H = I2Rt
Substituting the values we get,
H = (2.5)2 x 20 x 300 = 37500 J