a kilowatt hour measures electrical usage in the home usually 600 to 1200 kwh for the average home
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50 watts is 0.05 kilowatts, so in 24 hours it uses 0.05 x 24 kilowatt-hours, or 1.2 kilowatt-hours of energy.
1kilowatt = 1000 watts but you cannot compare a kilowatt hour to a watt, the extra dimension of time changes what is being measured. The watt is a measure of power. The watt second and the kilowatt hour is energy. The misunderstanding comes from our use of the term POWER COMPANY for our electricity suppliers. They bill us in kilowatt hours which is energy, not power.
If a kilowatt-hour is 10 cents, then 3.9 billion kilowatt-hours (billion meaning 109) has a value of 0.390 million dollars, or 390 million dollars.
1 kilowatt hour = 3,600,000 Joules 1 Tetrajoule = 1,000,000 Joules 1 kilowatt hour = 3.6 Tetrajoules
None. A cubic inch is a measure of volume while a kilowatt is a measure of power. The two measure different things and, according to the basic rules of dimensional analysis, conversion from one to the other is not valid.