2019 · Q46
A 100 W electric bulb is used for 10 hours a day. How many units of energy are consumed in 30 days?
General KnowledgePhysics
- A1
- B10
- C30
- D300
Explanation
Electrical energy consumed = power × time = 100 W × 10 h/day × 30 days = 30,000 Wh = 30 kWh. One ‘unit’ of electricity is one kilowatt-hour. Hence the device consumes 30 units in a month.