Question

an electric iron of resistance 20 ohm takes a current of 5 ampere calculate the heat developed in 30 seconds

Answer 1

Given :-

R = 20 Ω

I = 5 A

t = 30 s

H = I^2Rt

= (5)^2×20×30

= 15000 J

= 1.5 × 10^4 J