A 1.8-kW electric heater takes 15 min to boil a quantity of water. If this is done once a day and power costs 10 cents per kWh, what is the cost of its operation for 30 days?

What will be an ideal response?


W = pt = 1.8x(15/60) x30 kWh = 13.5kWh
C = 10cents x13.5 = $1.35

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