# power

## Definitions

### Accounting

• noun a mathematical term describing the number of times a number is to be multiplied by itself

### Agriculture

• noun the energy, especially electricity, which makes a machine or device operate

### Computing

• noun the unit of energy in electronics equal to the product of voltage and current, measured in watts
• verb to provide electrical or mechanical energy to a device

### Construction

• The rate of performing work or the rate of transforming, transferring, or consuming energy. Power is usually measured in watts, Btu/hour, or horsepower.

### Electronics

• The rate at which energy is expended, or at which work is performed. Its symbol is P, its abbreviation is pwr, and it is usually expressed in watts, or some multiple of watts, such as megawatts. When dealing specifically with the rate at which electric energy is utilized in a DC circuit or system, it is equal to the potential difference, expressed in volts, multiplied by the current, expressed in amperes. In an AC circuit or system, true power is the rate at which work is performed or energy is transferred, apparent power is the product of the RMS current and the RMS voltage, while reactive power is the power in an AC circuit which cannot perform work. Also called electric power (1).
• A number indicating the exponent to which another number, the base, is raised. For example, in 28, the 8 is the power, and the 2 is the base. Also called exponent.
• The product obtained when multiplying a given number by a given power (3). For instance, in 28,2 is raised to the 8th power, which results in 256.
• The multiplication of a given number or value by another, to express a multiple of a given standard or reference. For instance, 256X over-sampling, or a 64x DVD drive.
• A measure of the ability of a lens, or optical system, to magnify an image or object.
• abbreviationpwr

### Law

• noun a powerful country or state

### Media Studies

• noun the idea of having a voice, being represented, having a positive and truthful image constructed of you and the groups to which you belong, etc.

### Military

• noun a state with international influence which is based upon military strength
• verb to supply an apparatus or machine with mechanical or electrical energy

### Politics

• noun the authority or legal right to do things or to make people do things

### Sports

• noun physical force or strength
• noun the ability, strength, and capacity to do something

## Origin & History of “power”

Old Latin *potēre was the precursor of Latin posse ‘be able or powerful’ (source of English posse and possible). Its present participial stem potent- has given English potent. It seems to have remained current in colloquial speech, and by the 8th century ad was reasserting itself as the main form of the verb. It passed into Old French as poeir, later povoir (whence modern French pouvoir), and this came to be used as a noun, meaning ‘ability to do things’. Its Anglo-Norman version poer passed into English, where it became power.
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