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The heating coil of a hot water heater has a resistance of 20 Ohms and operates at 210 Volts. If electrical energy costs $0.

The heating coil of a hot water heater has a resistance of 20 Ohms and operates at 210 Volts. If electrical energy costs $0.080/kWh, what does it cost to raise the 200 kg of water in the tank from 15 degrees Celsius to 80 degrees Celsius?

This question was asked on Mar 29, 2010.

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