power

Dictionary


  • possession of controlling influence
  • "the deterrent power of nuclear weapons"
  • "the power of his love saved her"
  • "his powerfulness was concealed by a gentle facade" (physics) the rate of doing work
  • measured in watts (= joules/second) possession of the qualities (especially mental qualities) required to do something or get something done
  • "danger heightened his powers of discrimination" (of a government or government official) holding an office means being in power
  • "being in office already gives a candidate a great advantage"
  • "during his first year in office"
  • "during his first year in power"
  • "the power of the president" one possessing or exercising power or influence or authority
  • "the mysterious presence of an evil power"
  • "may the force be with you"
  • "the forces of evil" a mathematical notation indicating the number of times a quantity is multiplied by itself physical strength a state powerful enough to influence events throughout the world a very wealthy or powerful businessman
  • "an oil baron" supply the force or power for the functioning of
  • "The gasoline powers the engines"

    • Wikipedia




    Mechanical power - In physics, power (symbol: ''P'') is the amount of mechanical workwork ''W'' done per unit of time ''t''. This can be modeled as an energy flow, equivalent to the rate of change of the energy in a system, or the time rate of doing work, as defined by:P=\frac where'P''' is power'E''' is energy or mechanical workwork ''Wt is timeThe units of power are therefore energy divided by time. From this equation a further equation can be derived using a formula for mechanical workwork:E = \int \mathbf \cdot \mathrm \mathbf !therefore:P? = \int \mathbf \cdot \mathrm \mathbf where'F''' is force'v''' is velocity

    SI unit - The SI unit of power is the watt, which is equal to one joule per second.The power consumption of a human is on average roughly 100 watts, ranging from 85 W during sleep to 800 W or more while playing a strenuous sport. Professional cyclists have been measured at 2000 W output for short periods of time.

    Non-SI units - Non-SI units of power include horsepower (HP), Pferdestärke (PS), cheval vapeur (CV) and foot-pounds per minute. One unit of horsepower is equivalent to 33,000 foot-pounds per minute, or the power required to lift 550 pounds one foot in one second, and is equivalent to about 746 watts. Other units include: dBm, logarithmic measure with 1 milliwatt as reference; kilocalorie per hour (often referred to as ''Calories per hour'').

    Electrical power - ''Main article: Electric power''

    Instantaneous electrical power - The instantaneous electrical power ''P'' delivered to a component is defined as:: P = I \cdot V \,\!where 'P''' is the instantaneous power, measured in watts'V''' is the potential difference (or voltage drop) across the component, measured in volts'I''' is the current (electricity)current flowing through it, measured in amperesIf the component is a resistor, then:: P=I^2 \cdot R !\,\!or:where'R''' is the electrical resistanceresistance, measured in ohms

    Average electrical power for sinusoidal voltages - The average power consumed by a two-terminal electrical device is a function of the root mean square values of the sinesinusoidal voltage across the terminals and the sinusoidal electric currentcurrent passing through the device. That is,:P=I \cdot V \cdot \cos\phi \,\!where 'P''' is the power, measured in watts'I''' is the root mean square value of the sinusoidal alternating current (AC), measured in amperes'V''' is the root mean square value of the sinusoidal alternating voltage, measured in volts'φ''' is the phase angle between the voltage and the current sine functions. The amplitudes of sinusoidal voltages and currents, such as those used almost universally in mains electrical supplies, are normally specified in terms of root mean square values. This makes the above calculation a simple matter of multiplying the two stated numbers together. This figure can also be called the effective power, as compared to the larger apparent power which is expressed in volt-amperes reactive (VAR) and does not include the !\cos\phi
    Average electrical power for AC - :P = \int_ ^ i(t) v(t)\, dtWhere v(t) is the voltage over time and i(t) is the current over time.

    Electrical power transfer - The efficient transfer of electrical power is governed by the maximum power theorem, which states that for the transfer of maximum power from a source with a fixed internal resistance to a load, the resistance of the load must be equal to that of the source.

    Peak power and duty cycle - In the case of a periodic signal s(t) of period T, like a train of identical pulses, the instantaneous power p(t) = s(t)^2 is also a periodic funtion of period T. The ''peak power'' is simply defined by:: P_0 = \max p(t)The peak power is not always readily measurable, however, and the measurement of the average power P_ is more commonly performed by an instrument. If one defines the energy per pulse as:: \epsilon_ = \int_ ^ p(t) dtthen the average power is:: P_ = \frac \int_ ^ p(t) dt = \frac } One may define the pulse length \tau such that P_0\tau = \epsilon_ so that the ratios: \frac } = \frac are equal. These ratios are called the ''duty cycle'' of the pulse train.

    Power in optics - In optics, the term ''power'' is also used to express the ability of a lens (optics)lens or other optical device to focus light. It is measured in dioptres (inverse metres), and is equal to one over the focal length of the optical device.

    See also -
  • orders of magnitude (power)
  • pulsed power

    External links -
  • unitconversion.org - Online Power Converter - convert between various units of power, such as ''watt'', ''horsepower'', ''Btu/hour'', ''calorie/hour'', ''volt ampere'', ''joule/hour'', and so on
  • unitconversion.org - Interactive Power Conversion Table - convert selected unit to all other units of power
  • ibiblio.org - Power in resistive and reactive AC circuits
  • calc.skyrocket.de - Online Unit Converter - Conversion of many different unitsCategory:Power !Category:RadiometryCategory:Ph ysical? quantityCategory:Introductory !physicsbg:Мощностcs:Vý konda:Effekt? (fysik)de:Leistung !(Physik)et:Võimsuses:Potencia eo:Povumofr:Puissanceit:Potenz a? (fisica)he:הספקms:Kuasa (fizik)nl:Vermogen !(natuurkunde)ja:仕事率pl:Mo cpt:Potênciaru:Мощност ь? !(физика)sl:Močsv:Effekt

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