Transformers and Amperage

Discussion in 'General Electronics Chat' started by roadwaystrybran, Nov 10, 2015.

  1. roadwaystrybran

    Thread Starter New Member

    May 9, 2015
    8
    0
    Okay, help me out here folks...
    So I get that transformer output is basically just a ratio of primary coil turns by secondary. Pretty simple. But (and here's the kicker) does the amperage do the same thing in reverse? I.e. its inversely proportional to the voltage piece? Or even more simply, no matter what voltage/amperage you get at the output, power remains constant, not counting the power lost by inefficiency of all things? This is probably a scrub question, but thanks in advance.
     
  2. crutschow

    Expert

    Mar 14, 2008
    13,033
    3,241
    Yes, neglecting the transformer inefficiency, the power out equals the power in.
    Otherwise it won't be efficient. ;)
     
  3. ErnieM

    AAC Fanatic!

    Apr 24, 2011
    7,394
    1,606
    Yep sounds like you got it, power in = power out is a pertty good approximation.

    You do loose a little power from inefficiency.
     
  4. PackratKing

    Well-Known Member

    Jul 13, 2008
    850
    215
    Amperage in / out, depends on the diameter of the magnet wire, and the cross-section of the core... I have a number of these 40 pounders, that have the large [ #8 ] winding... as a secondary, and several taps off one long secondary, and of course, a normal primary...
    Output amperage on these, is equal to input...
     
  5. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,555
    2,375
    Transformers are rated in (K)Va.
    Max.
     
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