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Are you saying there is potential difference if there is more charges?

• "Are you saying there is potential difference if there is more charges than the other? How do you know how many charges? That say you have battery a wire going from + to the - and there is 5 charges at the + and 2 at the - than does that mean there is potential difference of 5 at the + a and 2 at the -?" Yes, the difference in the number of free charges at one location over the other creates a difference of potential, voltage. In your example, there is a three charge difference. The actual potential is not measured by the number of charges alone, rather by the energy per unit charge that is required to move a charged particle from one point to another in the physical system. +++++++++++++++++++++++++++++++++++ What is energy per unit charge ? And I think I'm having a hard time understanding what is a charge or charges mean and that why potential difference or difference in charge is hard to grasp. Does charge mean too many + or - ?

• Answer:

  charge is nothing there are just two things one is excess of electrons and other is lack of electrons when i say i apply a potential difference i apply voltage of opposite polarity. the atoms in a molecule don't stay neutral some gain electrons some loose electrons but overall they are neutral but when a potential difference is applied then the positive ones are attracted towards the negative side and negative ones are attracted towards the positive side the whole of molecule is neutral until voltage is applied