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Old Oct 26th 2010, 11:40 PM   #1
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electrically common points

When two points in a circuit are electrically common there is no p.d between them. With no p.d there is no current. How can this be since we have current flow throughout the circuit?
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Old Oct 27th 2010, 11:08 AM   #2
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PD is a work done by a unit charge, when a resistance is provided
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Old Oct 27th 2010, 08:18 PM   #3
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The good old pipeline analogy works here too. To translate anwaar's reply to terms of this analogy, a potential drop in an electric circuit can be thought of as the same thing as a difference in height between two points in a pipe. Think of a battery, or any voltage/current source, as a pump pushing electrons through the lines and various components. See why you still can have a current?
Keep in mind though, this is just an analogy and shouldn't be taken too literally.
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Old Oct 28th 2010, 11:49 AM   #4
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You can also think in terms of replusion.

If at one end of a wire there is a high potential, there is a force acting on the electrons in the wire and if there is a lower potential at the opposite end of the wire, the stronger force will cause the electrons in the wire to move.

If the two potentials are equal, there is an equal force at both ends and according to Newton's first law, there is no motion of electrons.
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