Question

What is the heat generated in joule in a heating element of resistence 9 ohm when a current 0.3a passes through10 seconds?

Answer 1

formula for heat is given by :-
H=i^2×r×t
where i= current
r= resistance
t= time
so heat produced in the circuit = (0.3)^2×9×10 J
= 9×0.9 = 8.1 J