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What does an electric current through a wire produce

Heat within the wire due to the movement of electrons. A magnetic field around the wire due to the movement of charged particles.

Answer

There are three ‘effects’ of an electric current. These are:

  1. heating effect
  2. chemical effect
  3. magnetic effect

Since 1948, the magnetic effect has been used to define the unit of current, the ampere -i.e. the ampere is defined in terms of the force between two, parallel, current-carrying conductors.

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