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charge motion?

Discussion in 'Electronic Basics' started by Miscura, Feb 3, 2005.

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  1. Miscura

    Miscura Guest

    when a current is flowing trought a circuit the electric charge which
    moves are only negative types or even positive charge move in the
    opposite toward? in other words: positive charges are heaviest than
    the negative charges, does this fact stop their moving? thanks
  2. Bob Masta

    Bob Masta Guest

    It's not the mass of the charges, it's that only electrons are mobile
    in normal circuit materials like metals. The rest of the atom becomes
    positive if an electron is missing, but there are still other electron

    bonds holding it to surrounding atoms in the metal, so it can't move.
    So only the negative electrons carry the current.

    Ionized gasses are different, since the ionized atoms aren't bound
    to neighbors and can move.

    In semiconductors there can be a situation where there are missing
    electrons in the crystal lattice. An electron can move from hole to
    hole to provide a current flow, which can be regarded as if the
    hole was moving in the opposite direction. So you get the
    equivalent of a positive carrier flow, in a practical sense if not
    in a literal sense.

    Bob Masta

    D A Q A R T A
    Data AcQuisition And Real-Time Analysis
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