power, in physics
power, in physics, time rate of doing work work, in physics and mechanics, transfer of energy by a force acting to displace a body. Work is equal to the product of the force and the distance through which it produces movement...... Click the link for more information. or of producing or expending energy energy, in physics, the ability or capacity to do work or to produce change. Forms of energy include heat , light , sound , electricity , and chemical energy.
..... Click the link for more information. . The unit of power based on the English units of measurement is the horsepower horsepower, unit of power in the English system of units. It is equal to 33,000 foot-pounds per minute or 550 foot-pounds per second or approximately 746 watts.
..... Click the link for more information. , devised for describing mechanical power by James Watt, who estimated that a horse can do 550 ft-lb of work per sec; a foot-pound is the work done when a weight (force) of 1 lb is moved through a distance of 1 ft. The unit of power in the metric system is the watt watt [for James Watt ], abbr. W, unit of power, or work done per unit time, equal to 1 joule per second. It is used as a measure of electrical and mechanical power.
..... Click the link for more information. , named in honor of James Watt and equal to 1 joule joule (j
l, joul), abbr...... Click the link for more information. per sec; the watt is used for measuring electric power in most countries, even those still using English units for other quantities. In common usage, the terms power and energy have become synonymous; for example, electrical energy is usually referred to as electric power (see power, electric power, electric, energy dissipated in an electrical or electronic circuit or device per unit of time. The electrical energy supplied by a current to an appliance enables it to do work or provide some other form of energy such as light or heat.
..... Click the link for more information. ). See also energy, sources of.
power, in mathematics
power, in mathematics: see exponent exponent, in mathematics, a number, letter, or algebraic expression written above and to the right of another number, letter, or expression called the base. In the expressions x2 and xn, the number 2 and the letter n..... Click the link for more information. .
power
In science and engineering, the time rate of doing work or delivering energy. Power (P) can be expressed as the amount of work done (W), or energy transferred, divided by the time interval (t): P = W/t. A given amount of work can be done by a low-powered motor in a long time or by a high-powered motor in a short time. Units of power are those of work (or energy) per unit time, such as foot-pounds per minute, joules per second (called watts), or ergs per second. Power can also be expressed as the product of the force (F) applied to move an object and the speed (v) of the object in the direction of the force: P = Fv. See also horsepower.
power
(1) See computer power.
(2) (POWER) (Performance Optimization With Enhanced RISC) A RISC-based CPU architecture from IBM used in its pSeries, iSeries and i5 computer lines. The PowerPC, enhanced by Motorola and Apple, is a single-chip version of the POWER architecture. POWER CPUs and PowerPC CPUs share a common instruction set that provides binary compatibility in some cases or compatibility by recompilation. Following is the evolution of POWER chips. See PowerPC, iSeries and pSeries.
Word
POWER Year Size # of
Series Intro. (bits) Trans. Features
POWER5 2004 64 276M
POWER4+ 2002 64 180M 0.13 process
POWER4 2001 64 174M
POWER3-II 2000 64 15M copper
POWER3 1998 64 15M SMP
POWER2 1993 32 15M
POWER1 1990 32 800K
SMP = See symmetric multiprocessing.
copper = See copper chip.
0.13 process = See process technology.
power
Power
The time rate of doing work. Like work, power is a scalar quantity, that is, a quantity which has magnitude but no direction. Some units often used for the measurement of power are the watt (1 joule of work per second) and the horsepower (550 foot-pounds of work per second). See Work
Power is a concept which can be used to describe the operation of any system or device in which a flow of energy occurs. In many problems of apparatus design, the power, rather than the total work to be done, determines the size of the component used. Any device can do a large amount of work by performing for a long time at a low rate of power, that is, by doing work slowly. However, if a large amount of work must be done rapidly, a high-power device is needed. High-power machines are usually larger, more complicated, and more expensive than equipment which need operate only at low power. A motor which must lift a certain weight will have to be larger and more powerful if it lifts the weight rapidly than if it raises it slowly. An electrical resistor must be large in size if it is to convert electrical energy into heat at a high rate without being damaged.
Power
| POWER - Performance Optimization with Enhanced RISC. The IBM processor architecture on which PowerPC was based. |
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