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  2. Audio power - Wikipedia

    en.wikipedia.org/wiki/Audio_power

    In his example, a loudspeaker with a continuous power rating of 250 watts would be well-matched by an amplifier with a maximum power output within the range of 400 to 625 watts. [27] JBL, which tests and labels their loudspeakers according to the IEC 268-5 standard (called IEC 60268-5 more recently) has a more nuanced set of recommendations ...

  3. Orders of magnitude (power) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(power)

    tech: electric power output of 1 m 2 solar panel in full sunlight (approx. 12% efficiency), at sea level 1.3 × 10 2: tech: peak power consumption of a Pentium 4 CPU 2 × 10 2: tech: stationary bicycle average power output [17] [18] 2.76 × 10 2: astro: fusion power output of 1 cubic meter of volume of the Sun's core. [19] 2.9 × 10 2: units ...

  4. Watt - Wikipedia

    en.wikipedia.org/wiki/Watt

    The watt (symbol: W) is the unit of power or radiant flux in the International System of Units (SI), equal to 1 joule per second or 1 kg⋅m 2 ⋅s −3. [ 1 ] [ 2 ] [ 3 ] It is used to quantify the rate of energy transfer .

  5. Decibel - Wikipedia

    en.wikipedia.org/wiki/Decibel

    The decibel originates from methods used to quantify signal loss in telegraph and telephone circuits. Until the mid-1920s, the unit for loss was miles of standard cable (MSC). 1 MSC corresponded to the loss of power over one mile (approximately 1.6 km) of standard telephone cable at a frequency of 5000 radians per second (795.8 Hz), and matched closely the smallest attenuation detectable to a ...

  6. List of metric units - Wikipedia

    en.wikipedia.org/wiki/List_of_metric_units

    Metric units are units based on the metre, gram or second and decimal (power of ten) multiples or sub-multiples of these. According to Schadow and McDonald, [ 1 ] metric units, in general, are those units "defined 'in the spirit' of the metric system, that emerged in late 18th century France and was rapidly adopted by scientists and engineers.

  7. Conversion of units - Wikipedia

    en.wikipedia.org/wiki/Conversion_of_units

    Conversion of units is the conversion of the unit of measurement in which a quantity is expressed, typically through a multiplicative conversion factor that changes the unit without changing the quantity. This is also often loosely taken to include replacement of a quantity with a corresponding quantity that describes the same physical property.

  8. Sound pressure - Wikipedia

    en.wikipedia.org/wiki/Sound_pressure

    1 m 8.93×10 2: 153 9-inch (23 cm) party balloon inflated to rupture [19] 1 m 731 151 Jet engine [13] 1 m 632 150 9-inch (23 cm) diameter balloon crushed to rupture [19] 0.95 m 448 147 9-inch (23 cm) diameter balloon popped with a pin [19] 1 m 282.5 143 Loudest human voice [21] 1 inch 110 135 Trumpet [22] 0.5 m 63.2 130 Vuvuzela horn [23] 1 m ...

  9. Kill A Watt - Wikipedia

    en.wikipedia.org/wiki/Kill_A_Watt

    The Kill A Watt (a pun on kilowatt) is an electricity usage monitor manufactured by Prodigit Electronics and sold by P3 International. It measures the energy used by devices plugged directly into the meter, as opposed to in-home energy use displays , which display the energy used by an entire household.