The cost to operate any electrical load, without taking into consideration
power company surcharges for low power factor loads, is calculated by
multiplying the number of kilowatt hours times the cost per kwH to determine the
cost for that period.
If you do not know the cost of electricity as charged by your power company,
do the following:
Divide the total kwH consumed for that period into the total dollar amount
charged. This total dollar amount will include taxes, fuel adjustment costs, and
other adjustments. The result will be the actual cost of electricity for that
level of consumption per kwH.
Note: For loads which are measured in watts, remember to divide by 1000 to
Formula is hours times kw times cost per kwH = cost in dollars to operate.
Example: If you want to calculate how much it costs to operate a pizza oven
for a three hour period, and the oven is 6000 watts, then the calculator
technique would be 3 (hours on) times 6000 watts (divided by 1000 to get kw)
times, say, 12 cents per kwH.
The result is an obvious $2.16 (Ignore the likelihood that the oven is
thermostatically controlled and may not be on the entire three hours)
Find practice problems HERE.
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