How much does electricty cost?

How much money to run a 100 watt light for an hour?
How much money to use a 600 watt device for 20 seconds?

Answer:
It depends when and where. The national average is $0.095 per KW/hr, but it will be more expensive in areas like California who add extra taxes. During peak times, like at 2 pm, it could go high as $.20 per KW/hr and it will be very cheap at night.

You you have a 100 watt light bulb at $0.10 kw/hr, then it cost you a penny to leave that light on for an hour. You can pay your mother so she stops complaining.

That 600 watt device is then well less than a penny.
It depends on where you live. Electricity is metered by kilowatt hour, and every company and location has their own rate plan, based on how much it costs that company to provide electricity to that location. The national average most appliance makers use to determine energy cost is 7 cents / kWh

So, using that rate..

100w light bulb: 0.7 cents
600w device for 20 seconds: 0.2 cents

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