What happens to the electrons in a wire when connected to a power
supply? How does this effect the resistance though different lenghs of wires?
Electrons are free to move, hence this creates a current when a power
supply is connected.
The resistance of a wire is proportional to the length and inversely
proportional to the cross sectional area, hence longer wires mean higher
resistance and large cross-sectional areas translate to lower
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Update: June 2012