Question

Your TV is rated at 500 watts and you leave it on for a whole week...

  1. Your TV is rated at 500 watts and you leave it on for a whole week (seven days), round the clock. If the electric company charges 10¢ per kilowatt-hour, what will you have to pay? [i.e. what will your bill be?]

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Answer #1

We know that,

Given, P = 500W and t = 1week = 7days = 7 x 24 x 60 x 60 seconds = 604800 seconds. So the energy consumption in the whole week is.

Charge of 1 kWh of energy = 10 cents. So the charge of 84 kWh of energy is,

So the bill will be 840cents.

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