Energy & power practice problems
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Read the energy & power class notes.
A 15-W light in some room in your house is on for exactly 18 hr per day.
How much energy is used by the bulb in 7 days?
If electricity costs $0.20 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?