Constants:

When finding my aim (I am trying to find out what affect changing the length of a piece of nichrome wire has on the current flowing through it. What happens if you change the thickness as well?) I need to make sure I do a fair test. This means I can only have one variable. Which means I need to keep some constant. I have chose to vary the length of the wire which means I will have to keep the diameter / thickness / thiness o the wire and the voltage from the power suppy the same.

Diagram:

I will need the following equipment:

1x Ammeter

1x Voltmeter

1x Power supply

1x Variable resistor

1x Length of nichrome wire

1x Meter-rule

6x Connecting wires

1x Crocodile clip

My prediction is:

If the length of the wire is increased, then the resistance will increase. This is because when the length is increased the current flow has longer to go, giving it more obstacles to come by. This is why I think the longer the wire is the higher the resistance will be.