Question

If a device uses 280 watts of power a day, about how many kilowatt-hours will it use in 30 days?

a.) 6,700 kilowatt-hours
b.)200 kilowatt-hours
c.)8.4 kilowatt-hours
d.)6.7 kilowatt-hours

Answer 1

Answer:C

Step-by-step explanation:

Power=280watts=280/1000 kilowatts

Power=0.28 kilowatts

Device use 0.28 kilowatts in 1 day

1day=24hours

Device use 0.28 kilowatts in 24hours

30days=30 x 24=720 hours

For 720 hours=(0.28x720) ➗ 24

For 720 hours=201.6 ➗ 24

For 720 hours=8.4