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We are conducting this experiment to determine whether altering a piece of resistance wire will affect its resistance.

Extracts from this document...

Introduction

Carrie Smith

Resistance of Wires

Aim:

We are conducting this experiment to determine whether altering a piece of resistance wire will affect its resistance.

Introduction:

All wires, no matter what metal they are, have resistance because all wires are made of atoms and when electrons try to pass through, there are collisions between them.  When these collisions occur, like in any type of collision, an energy transfer takes place where kinetic energy is changed into heat.  Therefore, some kinetic energy of the electron is lost becoming resistance and slowing down the electron’s journey through the wire.

Length:

The longer the piece of wire the more there are of atoms and when the electrons try to pass through the wire, the atoms act as obstacles.  As the length increases, there becomes more obstacles for the electrons to get past and so there are bound to be more collisions.

image00.png

Diameter:

When the thickness of the wire is increased, there is bound to be more atoms but also, overall there will be more gaps for the electrons to fit through so there will be less collisions and so less resistance.

image01.png

Material:

Each material has a different atomic

...read more.

Middle

2

10

0.10

0.03

3.3

37.7

6

2

100

0.74

0.02

37

6

2

10

0.12

0.03

4

33

7

2

100

0.58

0.02

29

7

2

10

0.10

0.04

2.5

26.5

8

2

100

0.38

0.03

12.7

8

2

10

0.04

0.03

1.3

11.4

9

2

100

0.60

0.02

30

9

2

10

0.10

0.03

3.3

26.7

10

2

100

0.83

0.02

41.5

10

2

10

0.15

0.03

5.0

36.5

From the preliminary results I have obtained, I have chosen to use wire number 4 for conducting my experiment because it has the largest range of resistance that is 82.3Ω.  I have also decided to obtain my results through the power pack voltage of 2V as it gives good results yet will not heat up the wire as much as a power pack voltage of 10V and I will use a wire range of 10cm to 100cm because it also gives good results, whilst still being manageable to conduct the experiment.

Method:

  1. Collect equipment and set up circuit as shown in the diagram
  2. Cut wire number 4 to exactly 100cm
  3. Attach to crocodile clips and switch circuit on
  4. Obtain results of current and voltage by reading the ammeter and voltmeter and then using the formula shown below to find resistance:

Voltage (V)

           Current (A)  = Resistance ()

...read more.

Conclusion

Temperature:

When I come to learn more about temperature I shall control the temperature by using a water-bath with temperatures at a range of 30°C to 60°C, but I will keep the length, diameter and material the same throughout this set of experiments to make it fair.  I predict the outcome for this experiment will be that as the temperature increases, atoms will be given more energy to vibrate more and so more collisions will occur, increasing resistance.

I could have also used a multimeter in place of the voltmeter and ammeter.  This would have made conducting my experiment much easier as the device works the resistance out for you instead of going to the trouble of using to separate devices and making calculations.

It may also have been a better idea to have used a rheostat in place of the bulb because it will not heat up and change the resistance of the wire like a bulb as it is simply a long coil of wire.

image03.png

...read more.

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