Find out from your latest bill from your electricity supplier how much you are paying for a kilowatt-hour. Multiply that charge by 1.38, so if the charge is 20 cents then 20 x 1.38 = 27.6 cents.
That bulb is 100 watts or 0.1 kilowatts so it uses 0.1 kilowatt-hour of energy each hour, which costs about £0.015
52 kilowatts per hour
Anything that uses 40 kilowatts would use 40 kilowatt-hours for each and every hour.
The cost of your solar system is directly related to how many kilowatts your home uses each month. That is what determines how much power you wish to generate.
A typical 15-year-old refrigerator consumed about 1,700 kilowatts of electricity, for an average annual cost of $136 based on a cost of eight cents a kilowatt-hour
A heater with a power rating of 80W will consume 0.08 kWh (80W = 0.08kW) of electricity in one hour. Multiplying this by the cost of electricity, which is 0.17.24p per kW, the heater would cost around 1.4p to run for an hour (0.08kW x 0.17.24p/kW).
Convert the watts to kilowatts, multiply by the time to get the energy (in kWh), then multiply by the rate.
I can't say exactly how much energy consumption earth hour saves but I do know that Toronto alone saves 2,347,600 kilowatts from it
Number of BTUs not relevant to this. A 1350 watt heater is 1.35 kilowatts. When operating one hour, will consume 1.35 KWhours. 1.35 x .07= your answer per hour.
The average cost is £70
5 kilowatts 5 kilowatts 5 kilowatts 5 kilowatts
I would guess about $12,000 per hour of flight