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Home Q & A Board Science-Related Homework Help Physics
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irina irina
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Posts: 919
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11 years ago
A 5-W night-light is plugged into a 120-V circuit and operates continuously for 1 year. Calculate the following:

1.the current it draws,
2.the resistance of its filament,
3.the energy consumed in a year, and
4.the cost of its operation for one year at a rate of 15 cents/kWh.
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wrote...
#1
11 years ago
It's only possible to give you vague  calculations. E = I R , P=IE. the frequency is never constant. there are some many variables.  The resistance unheated is about .7 ohms Ya gotta figure about 5 bucks a year.
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