Question

An electric iron of resistance is 200ohm takes a current of 5a calculate the heat developed in 30s

Answer 1

Answer:

H = VIT or H = i^2RT

I = 5A.

R = 200 Ohm

T = 30 seconds

$h = {5}^{2} \times 200 \times 30$

$= 25 \times 200 \times 30$

$= 25 \times 6000$

= 1,50,000 Joules or

150 kJ