Word Problems for Grade 11, Problem ID: 5357
Leslie Green asks:
Peter changes his old fashioned single 100W incandescent light bulb to a super efficient 4 LED bulb system which gives the same light output, but only consumes 20W in total.
Estimate the electrical energy saving per year if the bulbs are switched on for 8 hours every day of the year.
(1 kWh is 1000 Watts for 1 hour)
3,200 kWh320 kWh2,300 kWh230 kWh