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That will depends on (a) the type of television set, (b) the cost of electricity in your region, and (c) how long you keep it turned on. Take a look at the TV set's electrical specifications - how much it uses in watts. Most electric and electronic devices have a small metal plate that tells that. If it doesn't state the amount of watts, multiply volts x amperes to get watts. Multiply that by the number of hours you want to have it turned on, to get kilowatt-hours. Take a look at an electric bill, and divide the total amount by the number of kWh spent, to get an estimate of the cost per kWh.

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