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Thread: VA=watts

  1. #1

    VA=watts

    I have a plug in transformer that is 120v primary and 24v secondary. The rating stamped on it says 20va. I know this means apperant power but I was told that a good estimation is to think of VA as watts as in 20 watts. Does this mean that i should not put a load on this that is more than 20 watts?

  2. #2
    Join Date
    Dec 2006
    Location
    Chapel Hill, NC
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    26,418
    That is correct. 20 watt maximum.

  3. #3
    Join Date
    Nov 2004
    Posts
    3,172
    Quote Originally Posted by Timboe
    I have a plug in transformer that is 120v primary and 24v secondary. The rating stamped on it says 20va. I know this means apperant power but I was told that a good estimation is to think of VA as watts as in 20 watts. Does this mean that i should not put a load on this that is more than 20 watts?
    It means,

    Pa-max = 20VA = 24V*Iload-max

    then,

    Iload-max = 20VA/24V = 0.833A

    You may overload the transformer if you treat apparent power as real power.
    Don't mess with B+!
    (Signal Corps. Motto)

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