The Resistance of Wires - Length.
The resistance of any
wire depends on its length.
This makes sense if you consider that
however hard it is for electricity to flow through 1 metre of the wire,
it must be twice as hard to flow
through 2 metres
and 3 times as hard to flow through
3 metres etc.
As long as everything else about the wire remains the
same
(material,
thickness and
temperature)
then resistance is directly proportional to the length of wire.
Doubling the length will double
the resistance.
If we plot this on a graph, we get a straight line as shown below.
Headings Mains Electricity Search Questions 
gcsescience.com Contents Index Quizzes gcsescience.com
Copyright © 2011 Dr. Colin France. All Rights Reserved.