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how to calculate cost kwh. See which ones you can feel comfortable about replacing with compact fluorescent bulbs. Electricity price in pence per kWh - enter the cost you pay pence.
Make a habit of turning off lights when you leave a room. As an example if the KWH price is 172 cents the result 97352 cents. Convert Watt-Hours to Kilowatts Device Usage Wh 1000 WhkWh Device Usage in kWh.
Energy consumption calculation The energy E in kilowatt-hours kWh per day is equal to the power P in watts W times number of usage hours per day t divided by 1000 watts per kilowatt.
Multiply the result by the kwh price. Convert Watt-Hours to Kilowatts Device Usage Wh 1000 WhkWh Device Usage in kWh. As an example if the KWH price is 172 cents the result 97352 cents. 40 watts 1000 12 hours 15kWh 072.