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Resistivity and Length

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
Do you know the relationship between resistivity and resistance?

ρ=R AL \rho = \frac{R\,A}{L}

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

So you can work out A using πD4 \frac{\pi D}{4}
where D is the diameter of the wire, you know the length of your wire.
the equation:

resistance = resistivity (length/ cross sec area)
Reply 3
Avatar for matt2minger
matt2minger
OP
1
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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