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Cost of operating a heating element

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A heating element draws 7.50 A on a 120V line. At the rate of 8.00 cents per kW h what is the cost of operation for 5.00 h?

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The costs of operating a heating element is provided.

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SOLUTION.
We know that power dissipated in a resistor is give by P = I x V , where I and V are current and voltage on the resistor respectively. But this is for constant I and V. In our case, the heating element ...

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