Five bulbs each of 100 watt capacity in a tunnel are illuminated continuously for twenty hours. The consumption of electricity will be:
- AOne unit
- BTwo units
- CTen units
- DTwenty units
Show answer and explanation
Correct answer: (c) Ten units
Explanation
One unit of electricity equals 1 kilowatt-hour (kWh).
Energy = power × time = (5 × 100 W × 20 h) = 10000 Wh = 10 kWh.
Therefore total consumption is 10 units.