Battery charger how work

Discussion in 'General Electronics Chat' started by mrel, Sep 18, 2012.

  1. mrel

    Thread Starter Active Member

    Jan 20, 2009
    97
    1
    Hello
    Woodward Schumacher sure 1000 Fire automatic circuit breaker 10 amp battery charger model WS 1010 input 60 cyclce 117 vac 2 amp Output 6-12 VDC 10 Amp.
    Question is input voltage 117 vac and 2.amp,And output 6-12 Vdc10Amp.
    How did the battery charger give more ampere output (10 amp) when the input was only (2 amp) ?
    mrel
     
  2. MrChips

    Moderator

    Oct 2, 2009
    12,440
    3,361
    Power is transferred.
    Power out = efficiency x Power in
     
  3. PackratKing

    Well-Known Member

    Jul 13, 2008
    850
    215
    That is one of the fascinating aspects of electronics.
    The windings of the transformer are designed to drop the line input voltage to the level you need -- 12 v. and the amperage needed for the intended load, is a "fringe benefit" of reducing the voltage.
     
  4. Dodgydave

    Distinguished Member

    Jun 22, 2012
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  5. ErnieM

    AAC Fanatic!

    Apr 24, 2011
    7,388
    1,605
    The power in is Vin * Iin = 117 * 2 = 234 watts

    The power out is Vout * Iout = 12 * 10 = 120 watts

    So it's only about 50% efficient given your numbers. If that's true, it must run a bit warm.
     
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