Question

An alternative to CFL bulbs and incandescent bulbs are light-emitting diode (LED) bulbs. A 100-W incandescent bulb can be replaced by a 16-W LED bulb. Both produce 1600 lumens of light. Assuming the cost of electricity is $0.10 per kilowatt-hour, how much does it cost to run the bulb for one year if it runs for four hours a day?

Answer 1

Step-by-step explanation:

convert 16W to kilowatt

16 W / 1000 = 0.016 kW

It runs for 4 hours a day and for one year

so for 1 year, it runs for = 4 × 365 = 1460 hr

E ( kilowatt-hr ) = power × time = 0.016 kw × 1460 = 23.36 kwhr

$ 0.10 = 1 kilowatt-hr

the amount it will cost for a year = 23.36 kwhr × $ 0.10 = $ 2.336