Units of power

The watt (symbol: W) is the unit of power or radiant flux in the International System of Units (SI), equal to 1 joule per second or 1 kg⋅m2⋅s−3. It is used to quantify the rate of energy transfer. The watt is named in honor of James Watt (1736–1819), an 18th-century Scottish inventor, mechanical engineer, and chemist who improved the Newcomen engine with his own steam engine in 1776, which became fundamental for the Industrial Revolution.

Horsepower (hp) is a unit of measurement of power, or the rate at which work is done, usually in reference to the output of engines or motors. There are many different standards and types of horsepower. Two common definitions used today are the imperial horsepower, abbreviated hp or bhp, which is about , and the metric horsepower, also represented as cv or PS, which is approximately . The electric horsepower, hpE, is exactly , while the boiler horsepower is 9809.5 or 9811 watts, depending on the exact year.

unit of radiant flux in astronomy

The volt-ampere (SI symbol: VA, sometimes V⋅A or V A) is the unit of measurement for apparent power in an electrical circuit. It is the product of the root mean square voltage (in volts) and the root mean square current (in amperes). Volt-amperes are usually used for analyzing alternating current (AC) circuits. In direct current (DC) circuits, this product is equal to the real power, measured in watts. The volt-ampere is dimensionally equivalent to the watt: in SI units, 1 V⋅A = 1 W. VA rating is most used for generators and transformers, and other power handling equip

thumb|A schematic showing the relationship between dBu (the [[voltage source) and dBm (the power dissipated as heat by the 600 Ω resistor)]] dBm or dBmW (decibel-milliwatts) is a unit of power level expressed using a logarithmic decibel (dB) scale respective to one milliwatt (mW). It is commonly used by radio, microwave and fiber-optical communication technicians & engineers to measure the power of system transmissions on a log scale, which can express both very large and very small values in a short form. dBW is a similar unit measured relative to one watt (1000 mW) rather than a milliwa

term

measurement of signal strength and intensity

measurement of vehicle engine power

a theoretical unit of power representing the amount of electrical power in watts saved

unit of power

The poncelet (symbol p) is an obsolete unit of power, once used in France and replaced by (ch, metric horsepower). The unit was named after Jean-Victor Poncelet.

Airwatt or air watt is a unit of measurement that represents the true suction power of vacuum cleaners. It is calculated by multiplying the airflow (in cubic metres per second) by the suction pressure (in pascals). This measurement reflects the energy per unit time of the air flowing through the vacuum cleaner's opening, which relates to the electrical power (wattage) consumed by its electrical motor but is always smaller (due to unavoidable losses).

sections of power in watt each covering three orders of magnitudes (1000 times the previous factor).