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Science Resistant of a wire coursework

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Introduction

Saleh Imran Rasool 11N        

Science Resistance of the nichrome wire coursework

The main aim of my project is to investigate how the resistance of the wire is affected by various factors.

I am going to investigate what factors affect the resistance of a wire. There are three main factors which affect the resistance of a wire:
The material of the wire. (What the wire is made out of)
The length of the wire.
The thickness of the wire. (The diameter of the wire)

The factors which can be changed are the material, temperature, thickness, length, power and the voltage or current.

The factors I could measure are the voltage, current and the temperature.

I will change the length of the wire so that this would be an independent factor and is variable. All the rest of the factors such as material, temperature, thickness, setting of the power pack and current will be kept the same and the voltage will be measured for every change in the length.

Prediction

The prediction for this experiment is

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Middle

Pilot study

Length of wire (m)

Current

(Amps)

Voltage

(volts)

Resistance

(ohms)

0.10

0.35

0.63

1.80

0.20

0.35

0.87

2.49

0.30

0.35

1.12

3.20

0.40

0.35

1.33

3.80

0.50

0.35

1.65

4.71

0.60

0.35

1.77

5.06

0.70

0.35

2.10

6.00

0.80

0.35

2.33

6.65

0.90

0.35

2.53

7.23

1.00

0.35

2.75

7.86

The equipment used during this experiment is a power pack, variable resistor, wires,

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Conclusion

The graph which compares the length of the wire to the resistance it gives travels in a straight line through the origin. This means that the size of the length is directly proportional to the resistance it gives. I can work out the gradient of this line by dividing the height of the line by the width. (Gradient = height/width)

The gradient of the graph for nichrome wire is: 1/16 = 0.0625

There were a few wayward results. This could have been because the wires were not exactly the correct length or because I did not read the voltmeter and ammeter accurately. The wires might have been over-heated The temperature of the wire will affect the resistance. Hotter wires will have a higher resistance than cold wires. To improve my results I should have obtained more than one result for each wire and length. I could have then worked out an average for more accurate results.

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