What Values?

Discussion in 'General Electronics Chat' started by shortbus, Dec 6, 2009.

  1. shortbus

    Thread Starter AAC Fanatic!

    Sep 30, 2009
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    This is probably going to seem like a dumb question to most of you. But I can't seem to find a answer.

    If you have a transformer with the following specs:
    Primary- 240VAC, Secondary- 120VAC, VA- 500. Now what would the values be if the Primary was connected to 120VAC ?

    I know that the Secondary voltage should be 60VAC but what happens to the VA rating?

    Thank you, Cary
     
  2. dsp_redux

    Active Member

    Apr 11, 2009
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    Really depends on what is the load on the secondary. 500VoltsxAmps is the highest you should go.
     
  3. Wendy

    Moderator

    Mar 24, 2008
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    You will have ½ of the voltage, and I suspect ½ the current.
     
  4. shortbus

    Thread Starter AAC Fanatic!

    Sep 30, 2009
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    Thank you for replying.

    In my first example - 500VA / 120V = 4.16 Amps

    In the second- 250VA / 60V = 4.16Amps

    Is this correct? The available amps stays the same? Even though the VA is halved?

    Or am I thinking wrong that VA is figured the same as Watts?

    Cary
     
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