Question

Am electric iron of resistance 20 ohm takes a current of 5A.calculate the heat developed in 30s.

Answer 1

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Given, Current, I = 5A
Resistance, R = 20 ohm
Time, t = 30s

We know that, Heat developed, H = I^2Rt
= 25 × 20 ×30
= 15000 J
= 15000/1000 kJ
= 15 kJ

Answer 2

Given :-

R = 20 Ω

I = 5 A

t = 30 s

H = I^2Rt

= (5)^2×20×30

= 15000 J

= 1.5 × 10^4 J