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# Factors Affecting the Resistance of a Metal Wire.

Extracts from this document...

Introduction

Factors Affecting the Resistance of a Metal Wire

Introduction:

The aim of this investigation is to discover how a variable affects the resistance of a wire.

The variables I could test are:

1. Width of a wire
2. Length of a wire
3. Temperature of a wire
4. The material of the wire.

I have chosen to test how the length of a wire affects the resistance of it. This is because I believe I can most easily obtain a wide range of results. I decided against testing the width and temperature because the results are difficult to measure and therefore, my investigation may not be reliable. I shall keep the material of the wire constant so as to maintain reliable results.

Middle

Battery x2

Ammeter

Voltmeter

Rheostat

Wires

Crocodile clips

Prediction:

I predict that the resistance of the wire will increase as its length does, as proven in my preliminary work. This is because there will be more atoms

Conclusion

Method:

1. Set up circuit.
2. Mark on rheostat the three settings, which I shall be measuring the current from.
3. Check that the ammeter and voltmeter are working.
4. Put first length into the circuit using crocodile clips.
5. Measure the current and voltage.
6. Repeat experiment using all lengths and the different settings I have marked on the rheostat.

Below is a table of my results:

 Length V and I Calculations Resistance 20 cm 1 V = 0.60       I = 159.4 0.60   0.1594 3.764 2 V = 1.02   I = 139.3 1.020.1393 3.589 3 V = 0.42   I = 110.8 0.420.1108 3.791 Average Resistance = 3.715 60 cm 1 V = 1.02   I  = 80.0 1.200.0800 15.000 2 V = 0.73    I = 65.8 0.730.0658 11.094 3 V = 0.64    I = 57.7 0.640.0577 9.726 Average Resistance = 11.940 100 cm 1 V = 1.76    I = 94.3 1.760.0943 18.664 2 V = 1.56    I = 83.9 1.560.0839 18.954 3 V = 1.37    I = 73.6 1.370.0736 18.614 Average Resistance = 18.744 140 cm 1 V =  2.01    I = 77.9 2.010.0779 25.802 2 V = 1.80    I = 69.8 1.80.0698 25.788 3 V = 1.60     I = 61.8 1.600.0618 25.890 Average Resistance = 25.827 180 cm 1 V = 1.86    I = 56.4 1.860.0554 33.574 2 V = 1.73    I = 51.4 1.730.0514 33.658 3 V = 1.58    I = 46.9 1.580.0469 33.689 Average Resistance = 33.640 220 1 V = 1.95     I = 47.8 1.950.0478 40.795 2 V = 1.85    I = 45.2 1.850.0452 40.929 3 V = 1.72    I = 42.1 1.720.0421 40.855 Average Resistance = 40.860

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