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Correct abbreviations for electrical units.

One thousand watts is it 1Kw or is it 1KW both are used.

Is a "board of trade unit" 1Kwh or is it one 1KWH.


Likewise 1Mw or 1 MW

And 1Mwh or 1MWH.


And spelling.

Power inverter or power invertor or is either correct.
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  • davezawadi (David Stone):

    Simon, we do not usually refer to kK, and the temperature is not kelvins, it is Kelvin, say 300 K. The degrees are Centigrade degrees, just that the zero is moved, for very low temperatures, and certain thermodynamic points which depend on absolute temperature. 0K is about -273 degrees C.


    The National Physical Laboratory would disagree with you on that one, as would the US National Institute of Standards and Technology (NIST).  The unit of temperature is kelvin, and for current is ampere.  And the same for all the derived units (hertz, newton, pascal, joule, watt, and so on).

    https://www.npl.co.uk/si-units
    https://physics.nist.gov/cuu/Units/units.html


    But, oddly, temperature can also be in degrees Celsius, with a capital C.


Reply
  • davezawadi (David Stone):

    Simon, we do not usually refer to kK, and the temperature is not kelvins, it is Kelvin, say 300 K. The degrees are Centigrade degrees, just that the zero is moved, for very low temperatures, and certain thermodynamic points which depend on absolute temperature. 0K is about -273 degrees C.


    The National Physical Laboratory would disagree with you on that one, as would the US National Institute of Standards and Technology (NIST).  The unit of temperature is kelvin, and for current is ampere.  And the same for all the derived units (hertz, newton, pascal, joule, watt, and so on).

    https://www.npl.co.uk/si-units
    https://physics.nist.gov/cuu/Units/units.html


    But, oddly, temperature can also be in degrees Celsius, with a capital C.


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