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Factors Affecting the Resistance of a Metal Wire.

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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.

...read more.

Middle

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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

...read more.

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

  1.02

0.1393

3.589

3 V = 0.42

   I = 110.8

   0.42

0.1108

3.791

Average Resistance = 3.715

60 cm

1 V = 1.02

   I  = 80.0

  1.20

0.0800

15.000

2 V = 0.73

    I = 65.8

  0.73

0.0658

11.094

3 V = 0.64

    I = 57.7

  0.64

0.0577

9.726

Average Resistance = 11.940

100 cm

1 V = 1.76

    I = 94.3

  1.76

0.0943

18.664

2 V = 1.56

    I = 83.9

  1.56

0.0839

18.954

3 V = 1.37

    I = 73.6

  1.37

0.0736

18.614

Average Resistance = 18.744

140 cm

1 V =  2.01

    I = 77.9

  2.01

0.0779

25.802

2 V = 1.80

    I = 69.8

  1.8

0.0698

25.788

3 V = 1.60

    I = 61.8

  1.60

0.0618

25.890

Average Resistance = 25.827

180 cm

1 V = 1.86

    I = 56.4

  1.86

0.0554

33.574

2 V = 1.73

    I = 51.4

  1.73

0.0514

33.658

3 V = 1.58

    I = 46.9

  1.58

0.0469

33.689

Average Resistance = 33.640

220

1 V = 1.95

    I = 47.8

  1.95

0.0478

40.795

2 V = 1.85

    I = 45.2

  1.85

0.0452

40.929

3 V = 1.72

    I = 42.1

  1.72

0.0421

40.855

Average Resistance = 40.860

...read more.

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