how resistance effects a wire

Aim:
How resistance depends on the material of the wire.
Hypothesis:
I hypothesis that I will only need to induce two Voltages of 2v and 3v to find the results I need. I predict that I will only need to use two different voltages because the resistance will be the same whatever voltage I use but only if the material and length is kept constant.
Apparatus:
W Power supply
W (2) Crocodile Clips
W (3) Black circuit wires
W (1) Red circuit wires
W Voltmeter
W Ammeter
W Different SWG wires (28 SWG wire Constantan, 28 SWG wire Manganin, Copper Wire)

Method:
I have to setup my apparatus so that I can proceed with the experiment. Then I have to collect the three different types of wire, which were Copper, Manganin and Constantan. Then I must connect either side of the wires with crocodile clips, which are the connected to the circuit, which is connected to the power supply, voltmeter and ammeter.

Trial 1: Then the first object of the experiment is to turn the power supply on q...