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What affects the rate of resistance in a wire?

Extracts from this document...

Introduction

Physics Coursework – What affects the rate of resistance in a wire?

Aim:

I am planning to find out how a certain variable can affect resistance of a wire.

Variables:

There are a few variables, which can affect the resistance in a wire.

The thickness of the wire can affect resistance. The greater the cross-sectional area of the wire, the lower the resistance for like materials.

The length of the wire can affect resistance. The longer the wire, the greater the resistance as some of the energy is lost as heat.

The temperature can affect the resistance in a wire. The higher the temperature, the lower the resistance.

The material of which the wire is made from can affect the resistance. A poor conductor (i.e. Steel) has greater resistance than a good conductor (i.e. Gold)

Variable that I have chosen

I have chosen to investigate whether the resistance of a wire varies with changes in length.

Prediction

I believe that the resistance in the wire will increase as the length of the wire increases.

Reason

With electricity, the property that transforms electrical energy into heat energy, in opposing electrical current, is resistance.

...read more.

Middle

1.77

500

3.45

1.69

2.04

600

3.21

1.53

2.10

700

3.26

1.32

2.50

800

3.15

1.13

2.80

900

3.24

0.92

3.52

1000

3.19

0.76

4.20

Wire Length (mm)

Voltage (Volts)

Current (Amps)

Resistance (Ohms)

100

3.01

2.59

1.16

200

3.26

2.36

1.38

300

3.15

2.13

1.48

400

3.15

2.01

1.57

500

3.10

1.83

1.69

600

3.02

1.59

1.90

700

3.22

1.32

2.44

800

3.17

1.24

2.56

900

3.27

1.02

3.21

1000

3.01

0.82

3.67

Wire Length (mm)

Voltage (Volts)

...read more.

Conclusion

I do not think that doing any more results in my experiment would have made it any more accurate. I feel that the only way to make it more accurate would be to use a different method – perhaps if I used a metal bar that did not bend in place of the wire. I could even use a rheostat in place of the wire, because it is essentially a long coiled wire that is connected at different lengths to change the resistance of the circuit.

...read more.

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