Question

How do you find the cost of lighting a 100-W lamp for 10 hours at $0.10 per kilowatt-hour?

Answer 1

$0.10

Explanation:

`E=Pt`
`E=0.100kW xx 10h`
`E=1.0kWh`

`"Cost = Energy in kWh" xx Rate`
`"Cost" = 1.0kWh xx $0.10`
`"Cost" = $0.10`