In the context of power, the "ton" refers to the ton of refrigeration. There are many different definitions of a ton that are related to the measurement of weight. The term "horsepower" was developed by James Watt, who compared the output of steam engines to the power of draft horses based on how many times a horse could turn a mill wheel in an hour. Two of them are mechanical horsepower and metric horsepower.ġ unit of mechanical horsepower = 745.7 wattsġ unit of metric horsepower = 735.5 watts There are a number of different definitions of horsepower. Horsepower (hp) is a unit of power most commonly used to reference the output of engines or motors. For example, an AC marked with a label of 12,000 BTU actually has a power requirement of 12,000 BTU per hour. BTU/h is often abbreviated to just BTU to represent the power of appliances. Heat is a type of energy, so BTU can be directly compared to other measurements of energy such as joules (SI unit of energy), calories (metric unit), and kilowatt-hours (kWh).īTU/h, BTU per hour, is a unit of power that represents the energy transfer rate of BTU per hour. It is defined as the amount of heat that is required to increase the temperature of 1 pound of water by 1 degree Fahrenheit.
The reason that kilowatts-hours are typically used as a measurement of energy rather than watt-hours is simply because of scale: the amount of energy a typical household in the United States uses in a year is on the order of millions of watts, so it is easier to discuss in terms of kilowatt-hours instead.īritish thermal units (BTU) are a measurement of heat used as part of the Imperial and US customary units of measurement. Energy (E) and power (P) are related to each other through time (t):Įlectricity is most often measured and paid for based on the number of kilowatt-hours used. Generally, when discussing the cost of electricity, we talk in terms of energy. One kilowatt-hour is equal to the energy used to maintain one kilowatt of power for one hour. Kilowatt-hours (kWh) are a unit of energy. Both watts and kilowatts are SI units of power and are the most common units of power used. One kilowatt (kW) is equal to 1,000 watts. Watts (W) is a unit of power used to quantify the rate of energy transfer. Other common units of power include kilowatts (kW), British thermal units (BTU), horsepower (hp), and tons. One of the most common units of electrical power for appliances is the watt (W). The amount of time and power that each appliance is used varies significantly between households, so for the best results, adjust the usage for each appliance to most accurately reflect your personal usage. Use the calculator below to estimate electricity usage and cost based on the power requirements and usage of appliances. Home / other / electricity calculator Electricity Calculator
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