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# Resistivity and Length watch

1. Hi,

Values
Wire 2 - Length 200mm - Diameter 0.45mm
1.4468 Ω at 2v
1.4518 Ω at 4v
1.8820 Ω at 6v

Wire 3 - Length 200mm - Diameter 0.45mm
2.7873 Ω at 2v
2.7897 Ω at 4v
2.7864 Ω at 6v

q5.
Find how the resistance varies with the length of the wire.

Whats the best way to do this? Graphically?

Thanks
Matt
2. Do you know the relationship between resistivity and resistance?

where:
A - cross sectional area of wire
L - Length of wire
R - Resistance
rho - Resistivity

So you can work out A using
where D is the diameter of the wire, you know the length of your wire.
3. the equation:

resistance = resistivity (length/ cross sec area)
4. I understand what the resisitivity equation is, however i need to find out how the resistance varies with length? Surely i should draw some sort of graph?

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