Question

36000 joule heat energy is to be produced in an electric heater of resistance thousand ohm through which an electric current is passed for 5 minutes calculate the current passing through the heater

Answer 1

use formula H = I square * R * T
put them value and get your and convert time into sec also

Answer 2

H=36000J
R=1000 OHM
T=5 MIN               5 X 60SEC 300
I=?  (to be calculated)   

H=I(SQUARE)R x T
H= I x I X 1000 X 3000
I(SQUARE) =3000000
                      36000
I= UNDER ROOT 83.3
I= 9.13