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Homework Help: Electric current definition

  1. Dec 21, 2009 #1
    If electric current is stated in Wikipedia:

    "Electric power occurs when the electrical charge is transferred. Power is defined as charge per unit time. The charged particles are usually electrons, but can also be ions."

    Does anyone have an example of such currents, the ions then? Would be grateful for answers!
     
  2. jcsd
  3. Dec 21, 2009 #2

    mgb_phys

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    Re: electric

    Strictly it's when charge is transferred through a voltage difference so it can do work.
    Charge moving in a superconductor isn't doing work. Neither is a cpacitor moving with a machine.

    CURRENT is charge / time . Power is charge * voltage /time


    The current inside a battery would be due to ions moving, the current in a wire is due to electrons.
     
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