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# Resistivity of a wire - AS coursework watch

1. Im to do an experiment tomorrow, but ive no idea what kind of readings to take! Im going to be using a 100mA ammeter, to measure voltage and current. The current is to stay constant more or less but im not sure what ranges of readings im to take. Anyone help me please?
2. Resistivity=(Resistance(ohms)*Ar ea of cross section(m^2))/Length (m)

Thats if I remember correctly.

And of course:

Resistance (ohms) = (voltage (V)) / current (A)

With the voltage and current are measured, you can find the resistance. Measure the length of the wire and the area of a wire cross section (if you dont know how, ask) and substitute into equation 1 to find resistivity.

I assume thats basically what you need to do.

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Updated: March 2, 2006
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