Energy consumed = 250 units 1 unit of electrical energy = 1 kWh = 1000 W × 3600 s = 3.6 × 10⁶ J
Total energy in joules, \[ E = 250 \times 3.6 \times 10^6 = 9.0 \times 10^8 \, \text{J} \]
The household has consumed 9.0 × 10⁸ J of energy in a month.