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Floating DC power supplies

Discussion in 'Electronic Basics' started by PC, Sep 20, 2005.

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  1. PC

    PC Guest

    I have a floating AC/DC unregulated 48vdc (nominal) linear power supply
    ,just a transformer,rectifier bridge and filter caps.No problems so
    far.The manufacturer has opted to tie the positive output to ground for
    safety.Can someone explain why no current flows from the positive
    output to ground in this case please ? I need to study some more theory
    methinks !

  2. Current through a circuit requires a circuit (circle). Connecting
    ground or your left pinky or any other object to a supply at one
    point, only does not complete a circuit. It creates a branch. A dead
  3. PC

    PC Guest

    Thanks John
  4. PC

    PC Guest

    Just realised what a dumb question this was.If one connects the
    positive terminal of a car battery ( 'floating') to earth nothing
    happens,no current flows....
  5. Nice to see it making intuitive sense to you, now.
  6. Nice to see it making intuitive sense to you, now.
  7. PC

    PC Guest

    Appreciate your positive input John,thanks.....
  8. Jasen Betts

    Jasen Betts Guest

    the current has to flow in a circuit for some were current flow to ground
    there would have to be a path from ground to the negative terminal.

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