Current

Edited by Jamie (ScienceAid Editor), Taylor (ScienceAid Editor)

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Definition of Current

In a solid metal conductor, current is the flow of free electrons (negatively charged), which move from negative to positive, creating an overall movement of charge in this direction. In molten or dissolved electrolytes, it is the flow of negative ions (anions) toward the positive terminal and vice versa. For more about this see electrolysis in the chemistry section

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AC, DC

There are two types of current.

  1. 1
    Alternating current (AC)
    .
    An alternating current constantly changes direction. This is the kind of current used for most domestic electricity.
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  2. 2
    Direct current (DC)
    .
    A direct current passes in the same direction constantly. This is used to power electrified railway lines such as the London Underground.
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alternating and direct current ACDC

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Article Info

Categories : Electricity

Recent edits by: Jamie (ScienceAid Editor)

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