The two sets of units are not compatible. While a gallon may be converted to a litre, there is no relationship between kWh and hour.
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KWH
1 gallon of water weighs 8.34 pounds. It takes I BTU to change the temp of 1 pound of water 1 degree F. So for 1 gallon it takes 8.34 BTU. It takes 3412.14 BTU to equal 1 KWH. So 8.34 Btu x (1KWH / 3412.14 BTU) = 0.002444 KWH
A 60W bulb will use 60W X 1 hour / 1000. this will give you the KWh - the units your electricity company uses to charge you.So 60 X 1 =6060/1000 =0.060 Kwh
To calculate the 30-day cost with a rate of 13.1 cents per kilowatt-hour (kWh), you need to know the total energy consumption in kWh over that period. Multiply the total kWh used by 0.131 (which is 13.1 cents converted to dollars) to get the total cost. For example, if you used 1000 kWh in a month, the cost would be 1000 kWh × 0.131 = $131.
The number of kilowatts used by a device in one hour. This gives you the rate at which energy is consumed.