The standard values of acceleration of the standard gravitational field ( g n) and the international avoirdupois pound (lb) result in a pound-force equal toĤ.4482216152605 N. The pound-force is the product of one avoirdupois pound ( exactly 0.45359237 kg) and the standard acceleration due to gravity, 9.80665 m/s 2 (32.174049 ft/s 2). Product of avoirdupois pound and standard gravity The 20th century, however, brought the need for a more precise definition, requiring a standardized value for acceleration due to gravity. Since the 18th century, the unit has been used in low-precision measurements, for which small changes in Earth's gravity (which varies from equator to pole by up to half a percent) can safely be neglected. The pound-force is equal to the gravitational force exerted on a mass of one avoirdupois pound on the surface of Earth. Pound-force should not be confused with pound-mass (lb), often simply called pound, which is a unit of mass, nor should these be confused with foot-pound (ft⋅lbf), a unit of energy, or pound-foot (lbf⋅ft), a unit of torque. The pound of force or pound-force (symbol: lbf, sometimes lb f, ) is a unit of force used in some systems of measurement, including English Engineering units and the foot–pound–second system. Pound-forceĮnglish Engineering units, British Gravitational System For the monetary unit, see Pound (currency). For the basis weight of paper, see Paper density. Wavelength (λ): The distance between two peaks of a cycle.For the unit of mass, see Pound (mass). A Watt is a Joule (1 J) of work done in a second (1 s). Volt (V): A potential due to an electric field. Time (t): The symbol for time in seconds (s). Ohm (Ω): A measure of resistance or impedance. The distance light travels in 1/299,792,458 second. Length: (l): The symbol for distance in meters (m). Joule (J): The work required to move a Newton (1 N) a meter (1 m). Horse Power (HP): The power a horse can achieve. One Farad equals a capacitor that has a Coulomb (1 C) of charge on it with a voltage separation of a Volt (1 V). The unit cps (or kilocycles, megacycles, etc.) is more often seen in older documents.įarad (F): The SI unit for Capacitance (C). This is equivalent to Hertz, but Hertz is the official unit. Equals a coulomb (1 C) of charged particles moving past a point in one second (1 s).Ĭycles per second (cps): As the name implies, a measurement of frequency in full cycles of a wave per second. Hertz, meters, and seconds are units.Īmpere, Amp (A): The SI unit for current I. So we should copy all of these to the definitions page as well? Things like frequency, length, time and wavelength are not units they should be in the definitions section and not here. Ideally all the definitions in Units should find their way into the main definitions page. That's where the units page comes in handy as you only have to search through a small number of units to find the unit you want. Imagine doing a math problem and coming across Ξ. My take on the units page is that it is a guide for doing math problems. (Do we want these separated from the definitions page? or should we include all of these on the definitions page and just have a separate units page too?) One reason people don't understand math or Physics very well is that it literally is Greek to them. The majority of these units are named after famous people in the field who either discovered the units or had someone else name the units after them. These are the units you would find when doing problems in electronics.
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