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Thickness of a wire
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The thicker a wire, the smaller its resistance.
The greater the cross–sectional area of a wire, the smaller its resistance.
Electric current in a wire is a flow of electrons moving between ‘atoms’ (metal ions).
Doubling the cross-sectional area of a wire halves its resistance.
Doubling the cross-sectional area of a wire doubles the number of electrons that can flow through the wire.