Many pupils are confused by the idea of conventional current.

Electricity and Magnetism

Misconception RESEARCH REVIEW

Conventional current is defined to be in the opposite direction to the 'real' current of electrons. This can lead to confusion in some learners.

Diagnostic Resources

The following worksheets may help to identify whether students hold this particular misconception.

For more information, see the University of York EPSE website.

Resources to Address This

  • Episode 106: Electrical Power (16-19)

    Source - TAP/ Electricity/ Electric current/ ...

    Part of this resource preempts the common student confusion about conventional current, and suggests ways of addressing it.

    View Resource
  • History and the electric current convention (11-14)

    Source - SPT/ El01PN08

    In the metal conducting materials that we use to make electric circuits, it is the negative charged particles (the electrons) that are physically able to move around:

    By convention, however, the electric current is taken as flowing in the opposite direction towards the negative terminal.

    Why should it be that the conventional electric current is taken as being in the opposite direction to the motion of the electrons? The answer is that the convention arose historically.

    View Resource
  • The direction of the electric current (5-11)

    Source - SPT/ Ec01PN04

    Scientists agree to use a convention which shows the direction of the electric charge flow (the current) in a circuit as being from the positive terminal of the battery towards the negative terminal. This is in the opposite direction to the actual flow of electrons – the most common moving charges in circuits.

    This odd state of affairs came about because the convention was established before it was known that electrons move through the wires of a circuit.

    View Resource

References

The following studies have documented this misconception:

  • Pardhan, H. and Bano, Y. () Science teachers' alternate conceptions about direct-currents. International Journal of Science Education, 23 (3),

    301-318.

    Review sheet

  • Lee, Y. and Law, N. () Explorations in promoting conceptual change in electrical concepts via ontological category shift. International Journal of Science Education, 23 (2),

    111-149.

    Review sheet

  • Çepni, S. and Keleş, E. () Turkish students' conceptions about the simple electric circuits. International Journal of Science and Mathematics Education, 4 (2),

    269-291.

    Review sheet

  • Heller, P. M. and Finley, F. N. () Variable Uses of Alternative Conceptions: A Case Study in Current Electricity. Journal of Research in Science Teaching, 29 (3),

    259-275.

    Review sheet

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