To see how the length of a wire will effect it’s resistance.

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AIM:

To see how the length of a wire will effect it’s resistance.

RESISTANCE:

Resistance occurs when the electrons travelling along the wire collide with the atoms of the wire.
These collisions slow down the flow of electrons causing resistance. Resistance is a measure of how
hard it is to move the electrons through the wire.

PREDICTION:

I predict that if the length gets longer then the resistance gets higher and if the length gets shorter then the resistance gets lower.

METHOD:

The connections and the voltage on the power pack were kept the same.

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The crocodile clips on the wire and the position on the variable resistor were changed.

1- The apparatus was set up.

2- Two crocodile clips were put on the wire, one at 1cm and the other at 100cm.

3- Changed the position on the variable resistor three times.

4- Recorded figures on amp meter and voltmeter each of the three times.

5- Calculated the average of the three.

6- Using the averages (and R=V/I), calculated the resistance.

7- Repeated steps 1-6, reducing the length of the wire by 10cm each time, i.e., 100, 90, 80….until 10cm.

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