Answer:
The country is saved 1.0647×10^10 kWh of electricity per year.
Step-by-step explanation:
Power saved per household = 60 W - 10 W = 50 W = 50/1000 = 0.05 kW
Power saved in 117,000,000 households = 117,000,000 × 0.05 kW = 5,850,000 kW
Number of hours the bulb is used per week = 35 hours
Number of hours the bulb is used per year (52 weeks) = 52 × 35 = 1,820 hours
Quantity of electricity saved per year = 5,850,000 kW × 1,820 hours = 1.0647×10^10 kWh
Answer:
10,647,000,000 kWh per year of electricity is saved.
Step-by-step explanation:
Given:
Time, t = 35 hours/week
In 1 year, assume 52 weeks in 1 year:
35 hours/week * 52 weeks/1year
= 1820 hours/year
Bulb used by households = 60 W
Power of replaced bulbs = 10 W
Power saved per household = 60 - 10
= 50 W
Power saved in 117,000,000 = 117,000,000 × 50
= 5,850,000,000 W
= 5,850,000 kW
Energy saved = power x time
= 5,850,000 × 1820
= 10,647,000,000 kWh per year.
