What is a kilowatt hour (kWh)?

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What is a kilowatt?

A kilowatt is simply a measure of energy equal to one thousand watts (1000 watts) of electricity. It has no reference to the time over which the energy is used it is just an instant measure of power. Appliances such as solar panels or generators are often rated in kilowatts, being the peak amount of power the appliance can produce (in the case of a generator) or consumer (in the case of an air-conditioner).

What is the abbreviation for a kilowatt?

The abbreviation for a kilowatt is kW.

What is a kilowatt hour?

A kilowatt hour is a unit of electrical energy you will see on your energy bill. It is equivalent to a single 1000 watt (1 kW) device used continually for 1 hour.

Power= Current (Amps) x Voltage
P= I x V

What is the difference between kW and kWh?

A kilowatt hour is a measure of total energy and it refers to the amount of energy used over a period of time. It is the electrical draw of the appliance in kilowatts (so a 10 watt light bulb is 0.01 kW) multiplied by the time the appliance is used. A kilowatt is simply a number that represents the electrical peak draw of an appliance. A kilowatt hour refers to the actual energy used because it incorporates a measure of how long the electrical energy was used for.

What is the kW to kWh conversion?

There is no direct conversion from kW to kWh in that they are different things. However, you get kWh’s by multiplying the kW’s used by the number of hours it is used for. So a one kilowatt appliance used for 1 hour would use 1 kWh.

How much does a kWh cost?

According to the Energy Information Administration the average energy cost of a kilowatt hour of electricity in the US in 2020 is around 13 cents per kilowatt hour. However, this number varies a lot around the country and in states like California, Massachusetts and several others the average cost of electricity is around 20 cents.

What is the abbreviation for kilowatt hour?

The abbreviation for a kilowatt hour is kWh.

How many kWh per day does the average home use?

The average kilowatt hours used by a home in America is 867 kilowatt hours per month meaning the average kWh per day use is approximately 29 kWh per day.

What is a watt?

A watt of electricity is a measure of power.

Power, in turn, is a function of the voltage of a circuit multiplied by the current.

What is a watt hour?

A watt hour is 0.001 of a kilowatt hour and is equivalent to one watt of energy being used continually for an hour.

Some examples of how to calculate kilowatt hours (kWh) of usage from specific devices in your home:

You can work out how many kilowatt hours each appliance in your home used by multiplying the peak drawing capacity of the appliance by the amount of time it is used.

One kWh of electrical energy would also be used in each of the following cases:

  • a single 20 Watt light bulb was used for 50 hours; or
  • one hundred 20 watt light bulbs were used for 30 minutes;
  • or A television that uses 100 watts was left on for 10 hours per day;
  • or A 10 kilowatt kW HVAC, using 10,000 watts, was run for six minutes to cool your home when you arrive home from work.

kWh of energy is the standard unit in which power is bought and sold to consumers.

What's best to cut kWh use on your electric bill, energy efficiency or solar?

The potential to reduce the kWh of electricity you use through energy efficiency depends on how much power you currently use, how efficient your appliances are at using electricity and whether or not you are prepared to make lifestyle changes to save energy. In some instances, there are significant potential savings from energy efficiency measures.

However, for most people who own single-family homes in areas with high power prices, there are far greater potential savings from solar panel installation.

kilowatt meter on wall

How many kilowatt hours of power does the average house use?

The government records data about the amount of kilowatt hours of power used by American homes. The average American home uses 10,766-kilowatt hours per year or 897 kWh per month. This is equivalent to 10.76 megawatt hours of energy consumption. While a kilowatt is 1,000 watts of energy a megawatt is 1 million watts of energy. Output from power plants are measured in megawatt hours (mWh).

How many kilowatt hours (kWh's) of electricity will solar panels produce on your roof?

Our website contains a solar kWh calculator that will tell you how much electricity solar panels will produce if installed on your roof. If you are a homeowner we highly recommend that you use the calculator because all you have to do is enter your address and the cost of your last months electricity bill and it will tell you how many solar panels you would need to wipe out your electric bill, how much they would cost and how much solar will save you over the life of the system. It is important you do this asap because the 26% federal solar tax credit the currently makes solar panels a good investment ends at the end of 2020.


Calculate cost per kWh, savings and compare solar quotes online

Calculate cost per kWh, savings and compare solar quotes online