A house has 5 fans of 70 W each that operates for 16 hours a day and one washing machine of 2000 W that operates for 1 hours per day in the month of June. What is the energy consumption(in kWh) of the house in the month of June?

• A. 235.6
• B. 228
• C. 486.6
• D. 350

Answer: (B)

Energy consumption or power consumption refers to the electrical energy per unit time is given as
E = Power × Time = P × T
(i) 5 fans of 70 watts working 16 hours per day
Energy consumption = power × Time = 5 × 70 × 16 = 5600 watt-hr
(ii) One washing machine of 2000 watt operating for 1 hours
Energy consumption = 2000 × 1 = 2000 watt-hr
Energy consumption in the month of June i.e for 30 days
(Energy consumption of Fan + Energy consumption of Washing Machine) × 30
 (5600 + 2000) × 30 = 228000 watt-hr or 228 KWH