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Power

The number of times a number or expression is multiplied by itself, for which the symbol is an index or exponent. For example, is the fourth power of x.



: Anything raised to the power of 0 is equal to 1, including 0 to the power of 0.
: Other notation used to denote x raised to the power of n, xⁿ = x^n = x**n

Mechanical Engineering

Power is defined as the rate of doing work. The SI unit of power is the watt or joules per second.

It may also be determined by
where: P = Power [Js^-1 or W]; F = Force [N]; v = velocity [ms^-1]

Conversions
1 ft lbfs^-1	=	1.356 W		1 ft lbf min^-1	=	0.0226 W
1 horsepower	=	550 ft lbfs^-1		1 horsepower	=	745.7 W
1 ft poundal sec	=	0.0421 W

Examples
Family car (100PS)	7.4x10⁴ W
Sun energy production	3.9x10²⁶ W

See also: Active Power, Brake Horse Power, Cheval Vapeur, Horsepower, Motive Power, Power to Weight Ratio, Prony, SI Units, Torque to Power, True Power.

Subjects: Physics