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The Resistance of Wires - Material.
The resistance of a wire
depends on the material
from which the wire is
made.
Nearly all
wires are made of metal,
since metals are good conductors of
electricity.
Some metals are better conductors than others.
Wires
are usually made from copper or
aluminium
which both have a very low
resistance.
Wires made from iron or steel have a
higher resistance.
Alloys (metal
mixtures) can be made which have a very high resistance.
These can be useful for making variable resistors.
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