Energy & power practice problems
Refresh the page to get a new problem.
Read the energy & power class notes.
A 75-W light in some room in your house is on for exactly 8 hr per day.
How much energy is used by the bulb in 7 days?
If electricity costs $0.08 per kW·hr, how much does it cost to have the light on during that time?
What is the average power used by the bulb during that time?