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# Main Investigation - Resistance of a wire

Extracts from this document...

Introduction

Dean Greer

Science Coursework

10th May 05

Main Investigation – Resistance of a wire

Aim:

The main point of this experiment is to find out how resistance is affected by the length of wire.

Apparatus:

Here is a list of apparatus that I will need:

• Power Supply
• Wire on a Board
• Ammeter
• Voltmeter
• Wires
• Crocodile Clips

Middle

Method:

Here is a list of variables I have identified:

• Length of wire
• Temperature of wire
• Voltage from power supply
• Thickness of wire

The variable I am choosing to alter is the length of wire because that is what the whole experiment is about.

I will improve what we did in the prelim by controlling all the variables i.e. I will keep the power supply at one amp, I will allow the wire to cool and I will use the same thickness of wire.

Step by Step Plan:

1. Set up the equipment as shown in the diagram.
2. Set the crocodile clip at a certain length, start at 10 cm.

Conclusion

Evaluation:

I feel that the experiment was, on the whole, a fair test. I have noticed an anomalous reading. The resistance of 30cm is the same as the resistance for 20cm. I believe that this was because the wires were not connected properly. I think that my results are reliable because they were carefully recorded.

This student written piece of work is one of many that can be found in our GCSE Electricity and Magnetism section.

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