Voltage question

Discussion in 'General Electronics Chat' started by BigD, Oct 9, 2006.

  1. BigD

    Thread Starter New Member

    Oct 9, 2006
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    So I know a voltage can be negative with respect to another relatively higher voltage, but can a voltage ever be lower than or negative with respect to earth ground (0 volts).
     
  2. pebe

    AAC Fanatic!

    Oct 11, 2004
    628
    3
    Yes it can. A simple example would be where you connect the +ve pole of an AA cell to ground. Its -ve connection will then be at a potential of -1.5V relative to ground.
     
  3. jtodd5781

    New Member

    Sep 29, 2006
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    Yes it can be negative in respect to ground.
     
  4. Papabravo

    Expert

    Feb 24, 2006
    10,135
    1,786
    An AC signal is both positive and negative with respect to ground.
     
  5. Gadget

    Distinguished Member

    Jan 10, 2006
    613
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    And a Split Rail supply (common in Amplifiers and also PC supplies) has both Positive AND Negative rails with respect to ground.
     
  6. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    Here's another way of looking at it: "Negative" and "positive" simply indicate whether current would flow to the reference or from the reference as a result of the potential.
     
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