2023 · Q28
A 100 W electric bulb is used for 10 hours a day. How many units of electrical energy are consumed by the bulb in 3 days? (1 unit = 1kWh)
General KnowledgePhysics
- A3.00
- B1.08
- C2.16
- D0.33
Explanation
Energy = power x time = 100 W x 10 h = 1000 Wh = 1 kWh per day. Over 3 days this is 3 kWh. Since 1 unit of electrical energy = 1 kWh, the bulb consumes 3.00 units in 3 days.