Question

An electric iron of resistence 20 ohm draws a current of 5 ampheres.calculate the heat produced in 30 sec.

Answer 1

Here,
Resistance=20ohm
Current=5A
Time=30sec
Now,
H=I square×R×T
=25×20×30
=15000joule

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