FlyWheel document
Definition of flywheel : a heavy wheel for opposing and moderating by its inertia any fluctuation of speed in the machinery with which it revolves also : a similar wheel used for storing kinetic energy (as for motive power)
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A flywheel is a mechanical device which uses the conservation of angular momentum to store rotational energy; a form of kinetic energy proportional to the product of its moment of inertia and the square of its rotational speed.
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in 2020, the average kilowatts for a house was 893 kilowatt-hours per month or around 30 kilowatt-hours per day.
The difference between kW & kWh
Before working out how many kW a home uses or how many kWh a house uses per month, let’s differentiate between the two measurements.
The power of each home is measured in kilowatts (kW). One kW equates to 1,000 watts, whereas kilowatt-hours (kWh) measures your energy usage – or to put simply the power consumed per hour. So let’s put this in a real-time perspective. 1 kWh would be used to run a 1000-watt appliance for an hour (assuming no efficiency loss). Or on a smaller scale, a 100-watt lightbulb would run for 10 hours using 1 kWh.
How many kWh does a house use?
According to the U.S. Energy Information Administration, in 2020, the average kilowatts for a house was 893 kilowatt-hours per month or around 30 kilowatt-hours per day.
How many watts does a house use?
Next, we’ll calculate the average wattage for a house per day by using the median number of kWh per day. Wattage is the measurement of electrical power.
Below is the formula for converting kWh into watts:
watts = (kWh × 1,000) ÷ hrs
If it takes 30 kWh to power a house per day and we multiply that figure by 1,000, that means 30,000 watthours of energy is consumed within 24 hours.
Subsequently, if we divide 30,000 by the number of hours in a day (24) that means it takes around 1250 watts per hour to power a home. That averages out at 900,000 watts of which your appliances could be drawing out each month.
Nonetheless, this is based on the national average which is calculated in a 24-hour period – assuming that appliances are being used throughout that time period. When it comes to calculating your own wattage usage, note the wattage of appliances that need to be on all day like a refrigerator or freezer, and the wattage and frequency of usage of other devices during the day.
How many kW does a house use?
If the median watt-hours of a home per day is 30,000, to find out how many kilowatts it takes to run a house using direct calculations, simply divide the wattage by 1000 to get 30.
Below is the formula for converting watts into kilowatts:
kilowatts = P(W) / 1,000
That means that the average kW used in U.S. households is 30kW per day, which averages at around 900kW per month.
As a disclaimer, these figures are calculated from the U.S. home average of kilowatt-hours per day. A more precise calculation would be to conduct your own home audit by familiarizing yourself with the kW and kWh on each appliance.