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# Investigate the resistance of several wires, and the factors affecting this.

Extracts from this document...

Introduction

Physics Coursework

Planning:

## Introduction

Our aim is to investigate the resistance of several wires, and the factors affecting this.

The four factors that affect the resistance of a piece of wire:
Length,
Diameter or thickness,
Temperature and
The type of metal.
From thinking about how I would do this investigation and the outcome of it, I decided to use the length of the wire as the variable.

We have four wires to use in our investigation..

Resistance is the force, which opposes the flow of an electric current around a circuit so that energy is required to push the charged particles around the circuit. Resistance is measured in ohms. A resistor has the resistance of one ohm if a voltage of one volt is requires to push the current of one amp through it. Resistance occurs when the electrons travelling along the wire collide with the atoms of the wire.

## Strategy

The experiment was set up for maximum available exactness.

This is the equipment I will use:

1 Metre Ruler

Milliammeter

10Ω Resistor

2 Crocodile Clips

Power supply (1.2V battery)

Constantan SWG 30, 32, 34 Wires

Nickel chromium SWG 30 wire.

## Method

I took the four wires from their packets and pulled them straight, then attached the min

Middle

3.14

60

3.77

70

4.40

80

5.03

90

5.66

100

6.30

SWG 32 Constantan

 Length (cm) Resistance (Ω/ohms) 10 0.83 20 1.66 30 2.49 40 3.32 50 4.20 60 4.986 70 5.82 80 6.64 90 7.48 100 8.31

SWG 34 Constantan

 Length (cm) Resistance (Ω/ohms) 10 1.14 20 2.28 30 3.42 40 4.56 50 5.70 60 6.84 70 7.98 80 9.12 90 10.25 100 11.39

Nickel Chromium SWG 30

 Length (cm) Resistance (Ω/ohms) 10 1.37 20 2.75 30 4.12 40 5.49 50 6.87 60 8.24 70 9.61 80 10.98 90 12.36 100 13.73

I will now find predictions for Constantan SWG 32 wire.

R = 4.9 x 10-7 x 0.1

Π (0.000137) ²

=        4.9 x 10-8

5.89721980 x 10-8

R - 10cm of Constantan SWG 32 =

0.8310, which is 0.83 to 2 d.p.

Conclusion

As well as making these modifications, I could also expand on my investigation by testing the same wire but different widths of that wire. I would do this if I had more time to complete it. I think the circuit and method used was quite suitable although I would make the modifications above to improve my results. If I did this experiment again I would defiantly use top quality equipment, I would probably control the temperature and use pointers instead of crocodile clips. After changing those few things, there is not really much difference to how I would do the experiment again.

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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