How much energy is consumed when a current of 5 ampere flows through the filament of a heater having resistance of 100 ohms for two hours? Express it in joules.

Given, I = 5A

R = 100 ohm T = 2 hours We know that,

Energy consumed = P × T = I2RT Substituting the values,

Energy consumed = 5kWh 1kWh = 3.6 × 106J

Therefore, 5kWh = 5 ×3.6 × 106J = 18 × 106J