A 60 W electric lamp is used for 5 hours daily. Calculate the energy consumed in 'units' (kilowatt-hours) in 30 days.
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 9 units.
Power of the lamp = 60 W = 0.06 kW
Time used daily = 5 hours
Energy consumed per day = Power × Time
= 0.06 × 5 = 0.3 kWh
For 30 days:
Energy = 0.3 × 30 = 9 kWh
Thus, the total energy consumed in 30 days is 9 units (since 1 unit = 1 kWh).
This means the lamp uses a small amount of electricity daily, but over a month it adds up. Such calculations help in estimating electricity bills and understanding energy usage efficiently in everyday life.