On average an electric water heater operates for 12 h each


On average, an electric water heater operates for 1.2 h each day. It has a power requirement of 4500 W and a current requirement of 37.5 A when wired to a 240 V household supply.

(a) If the cost of electricity is $0.29/kWh, what is the cost of operating the heater during a 30-day month?

(b) What is the resistance of a typical water heater?

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Physics: On average an electric water heater operates for 12 h each
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