Physics Help Forum electrically common points

 Electricity and Magnetism Electricity and Magnetism Physics Help Forum

 Oct 26th 2010, 11:40 PM #1 Junior Member   Join Date: Oct 2010 Posts: 2 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?
 Oct 27th 2010, 11:08 AM #2 Member   Join Date: Nov 2008 Location: PAKISTAN Posts: 79 PD is a work done by a unit charge, when a resistance is provided
 Oct 27th 2010, 08:18 PM #3 Member   Join Date: Oct 2008 Posts: 66 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.
 Oct 28th 2010, 11:49 AM #4 Physics Team     Join Date: Jun 2010 Location: Mauritius Posts: 609 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. __________________ Jerry (Got my results!) It is easier to protect your feet with slippers than to cover the earth with carpet. No one can go back and change a bad beginning; but anyone can start now and create a successful ending. If a problem can be solved, no need to worry about it. If it cannot be solved what is the use of worrying?

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