Question

Find the heat produced in joules when a current of 10 amperes flows through a connecting wire of resistance 2 × 10^-2 ohms and heating element of resistance 250 ohms for 2 seconds.

Answer 1

Heat produced when current flows in the wire for 2 seconds

Q₁ = I²Rt

Q₁ = 10 x 10 x 2 x 10^-2 x 2

Q₁ = 4J

Heat produced in heating element in 2 seconds

Q₂ = 10 x 10 x 250 x 2

Q₂ = 50,000J