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Voltage at a point

  1. Jun 26, 2010 #1
    I was reading a book on circuits and came across the phrase "a voltmeter can measure the voltage at a point with respect to ground"

    I don't actually understand what this is supposed to mean in circuitry though. Don't people usually refer to the voltage drop across a resistor?

    I suppose this could be a homework question so mods can move it; in that case there is a simple circuit with battery and a resistor, how do you calculate voltage "at a point" in between?

    edit: i realized that "ground" is just an arbitrary point defined in a circuit, i missed that part reading it hehe
     
    Last edited: Jun 26, 2010
  2. jcsd
  3. Jun 26, 2010 #2
    ground is a common reference point that is chosen arbitrarily in the circuit. If there is only one EMF source, it is customary to be attached to its negative end.
     
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