Question

Electric iron of resistance 20 ohm draws a current of 5 ampere.
​Calculate the heat developed in 30 seconds .


My solution
H=I^2 Rt
H= (5^2 × 20 × (30÷3600))
H= 500×1÷120

Is it correct ??

Answer 1

Slight wrong no need to divide with 3600
It is already in second
Remaining are true
So do without dividing with 3600
Final answer is 15000

5^2 *20*30=15000