Question

calculate the heat produced in a device 400 ohm when a current 0.2A flows for 5 minutes

Answer 1

Using relation, H=I^2Rt Here,  H= heat, I= 0.2A, R= 400ohm  t= 5 minutes= 300 seconds Therefore,          H= (0.2)^2×400×300       =>  H= 16×300= 4800 joules