Trystan Casey
When it comes to electricity, understanding your usage and its cost can be challenging. Electricity is typically measured and billed based on kilowatt-hours (kWh), which is the standard unit of energy consumption. This unit is used because it is a more manageable scale than watt-hours, as the average household's annual energy usage is in the millions of watts. Other units of power include watts (W), kilowatts (kW), British thermal units (BTU), horsepower (hp), and tons. Online power converters can help you switch between these units, with some offering conversions for up to 76 different units. Calculators are also available to estimate electricity costs based on appliance power requirements and usage, helping you make sense of your electricity bills and potentially save money.
| Characteristics | Values |
|---|---|
| Unit of electrical power | Watt (W) |
| Watt definition | 1 joule per second |
| Watt named after | James Watt, inventor of the steam engine |
| Other common units of power | Kilowatts (kW), British thermal units (BTU), horsepower (hp), tons |
| Kilowatt definition | 1 kilowatt (kW) = 1,000 watts |
| Kilowatt-hour (kWh) definition | Energy used to maintain 1 kilowatt of power for 1 hour |
| BTU definition | Amount of heat required to increase the temperature of 1 pound of water by 1 degree Fahrenheit |
| BTU/h | Unit of power representing BTU per hour |
| Horsepower definition | Output of engines or motors |
| Ton definition | Rate of heat transfer necessary to melt 2,000 pounds (1 short ton) of pure ice at 0°C in 24 hours |
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What You'll Learn
Watt [W] to kilowatt-hour [kWh]
A watt (W) is a unit of power used to quantify the rate of energy transfer. It is defined as one joule per second. A kilowatt-hour (kWh) is a unit of energy that is equivalent to the energy used to maintain one kilowatt (or 1,000 watts) of power for one hour.
Kilowatt-hours are typically used as a measurement of energy rather than watt-hours because of scale; the amount of energy a typical household in the United States uses in a year is in the millions of watts, so it is easier to discuss in terms of kilowatt-hours.
To convert watts to kilowatt-hours, multiply the power in watts by the number of hours, then divide by 1,000. The formula is: E(kWh) = P(W) x T(h) / 1,000, where E is energy, P is power, T is time, (kWh) is kilowatt-hours, (W) is watts, and (h) is hours.
For example, let's find the kWh of 1,500 watts for 2.5 hours. The equation would be: E(kWh) = 1,500 x 2.5 / 1,000. E(kWh) = 3,750 Wh / 1,000. E(kWh) = 3.75 kWh.
You can also use this formula to convert kilowatts to kilowatt-hours by not dividing by 1,000.
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Kilowatt-hour [kWh] to cost
Kilowatt-hours (kWh) are a unit of energy used to quantify the rate of energy transfer. One kWh is equal to the energy required to maintain one kilowatt of power for one hour. Kilowatt-hours are a common unit of measurement for electricity because they provide a more manageable scale than watt-hours; the amount of energy a typical household in the United States consumes in a year is in the millions of watts, so it is more practical to discuss energy consumption in kilowatt-hours.
Electricity costs are calculated based on the number of kilowatt-hours used. To calculate the cost of electricity, multiply the number of kilowatt-hours consumed by the electric rate, which is typically given in cents per kWh. The national average electricity rate in the United States is 13.87 cents per kilowatt-hour, but rates vary by region, ranging from 7.18 cents per kWh in North Dakota to 42.34 cents per kWh in Hawaii.
You can estimate the cost of running an electrical appliance by first calculating its energy consumption in kilowatt-hours and then multiplying this figure by the electric rate. Online electricity calculators can assist with this process by estimating energy consumption and cost based on the power requirements and usage of specific appliances. These calculators can also help determine the cost of powering electric devices and the kWh cost per device for your electric bill.
It is important to note that the power requirements listed on an appliance's packaging generally reflect the maximum energy requirements. Typical usage of an appliance usually results in lower energy consumption than stated. Therefore, it is recommended to adjust the usage for each appliance to reflect personal usage accurately when using electricity calculators.
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British Thermal Units [BTU] to joules
British Thermal Units (BTU) and joules are both units used to measure energy. A BTU is defined as the amount of heat energy required to increase the temperature of one pound of water by one degree Fahrenheit. This unit of measurement is used in the US and as part of the Imperial System. One BTU is equal to 1,055.055853 joules.
To convert BTU to joules, you can use the following formula:
> BTU x 1,055.055853 = joules
For example, to convert 4 BTUs to joules, you would perform the following calculation:
> 4 BTU x 1,055.055853 = 4,220.22 joules
So, 4 BTUs is equal to 4,220.22 joules.
BTU is often used to represent the power of appliances, such as air conditioners, where it is abbreviated to BTU/h or BTU per hour. For instance, an air conditioner labelled with 12,000 BTU has a power requirement of 12,000 BTU per hour.
Appliances are often rated in watts (W), which is a unit of power used to quantify the rate of energy transfer. One watt is defined as one joule per second. A kilowatt (kW) is equal to 1,000 watts and is another common unit of power. Kilowatt-hours (kWh) are used to measure energy, with one kilowatt-hour representing the energy used to maintain one kilowatt of power for one hour.
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Horsepower [HP] to watts
The watt is a unit of power used to quantify the rate of energy transfer. It is defined as 1 joule per second. The term horsepower was developed by James Watt, who compared the output of steam engines to the power of draft horses. Watt was not the first person to compare the output of horses to that of engines, as early as 1702, Thomas Savery referenced horses when describing the output of an engine.
Horsepower (boiler) to watt: 1 horsepower (electric) = 746 watts. Horsepower (electric) to watt: 1 horsepower (water) = 746.043 watts.
Mechanical horsepower, also known as imperial horsepower, is defined as approximately 745.7 watts, while metric horsepower is approximately 735.5 watts. When rating electric motors, one horsepower is equal to 746 watts.
The watt as a unit of power should not be confused with its energy counterpart, the watt-hour. The watt is the SI derived unit of power and is used in many applications worldwide. Most countries now use the SI unit watt for the measurement of power. With the implementation of the EU Directive 80/181/EEC on 1 January 2010, the use of horsepower in the EU is permitted only as a supplementary unit.
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Watts to money
Watts (W) is a unit of power used to quantify the rate of energy transfer. It is defined as one joule per second. A kilowatt is a multiple of a watt, with one kilowatt (kW) equal to 1000 watts. Both watts and kilowatts are SI units of power and are the most common units of power used.
Kilowatt-hours (kWh) are a unit of energy. One kilowatt-hour is equal to the energy used to maintain one kilowatt of power for one hour. Electricity is most often measured and paid for based on the number of kilowatt-hours used. This is because the amount of energy a typical household in the United States uses in a year is in the millions of watts, so it is easier to discuss in terms of kilowatt-hours.
To convert watts to money, you would need to know the cost of electricity in your region per kilowatt-hour. You could then calculate the number of kilowatt-hours consumed by a device using watts and determine the cost. For example, if a lightbulb consumes 75W of power in one hour, it has consumed 0.075kWh of energy. If electricity costs $0.10 per kWh, the cost of running the lightbulb for one hour would be $0.0075.
It is important to note that the cost of electricity varies depending on location and other factors. Additionally, the power rating of appliances is often given in watts, but this does not account for the time the appliance is used. Therefore, it is more useful to consider the energy consumed in kilowatt-hours when calculating the cost of electricity.
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Frequently asked questions
You can calculate your electricity bill by multiplying the power requirement of an appliance by the time it is used. You can then use this number to calculate the cost of running the appliance.
A kilowatt-hour is a unit of energy equal to the energy used to maintain one kilowatt of power for an hour. Kilowatt-hours are used as a measurement of energy because they are a more convenient scale than watt-hours.
To convert kilowatt-hours into money, you need to know the cost of electricity per kilowatt-hour in your region. You can then multiply the number of kilowatt-hours used by the cost per kilowatt-hour to get the total cost.
