# 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
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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
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An AC signal is both positive and negative with respect to ground.

5. ### Gadget Distinguished Member

Jan 10, 2006
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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
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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.