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 = 1 kWh)
3.00
1.08
2.16
0.33
Answer is Wrong!
Answer is Right!
This question was previously asked in
UPSC CDS-1 – 2023
Power (P) = 100 W.
Time used per day = 10 hours.
Total time used in 3 days = 10 hours/day × 3 days = 30 hours.
Energy consumed (in Watt-hours) = P × Time = 100 W × 30 hours = 3000 Wh.
To convert Watt-hours to kilowatt-hours (units), divide by 1000:
Energy consumed (in kWh) = 3000 Wh / 1000 Wh/kWh = 3 kWh.
Since 1 unit = 1 kWh, the energy consumed is 3 units.