AC Input current

Discussion in 'General Electronics Chat' started by superway, Sep 21, 2010.

  1. superway

    Thread Starter Active Member

    Oct 19, 2009
    128
    0
    Hello,

    Can anyone help me this question?
    What fomulars to find out the AC input current when increasing AC load at AC output of power transformer?
    If we can determine the input current by the fomulars, then I don't need to cut the wire insulation to measure the input current on the input hot wire.

    Thanks in advance.

    ken
     
  2. gerty

    AAC Fanatic!

    Aug 30, 2007
    1,153
    304
    Since it's ac wouldn't it be easier to use a clamp on ammeter?
    You wouldn't have to cut any wiring.
     
  3. marshallf3

    Well-Known Member

    Jul 26, 2010
    2,358
    201
    It's basically watts in = watts out x [(efficiency in %)/K] but you can usually figure it as

    watts in = watts out as a rough estimation, at least close enough for most calculations.

    To really get the rest of it becomes quite complicated due to the core, wire sizes and the way it's wound.
     
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