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I will be studying the resistance of wire, to gain a better understanding of resistance and connecting topics.

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Introduction

Resistance of wire

Rebecca Doorbar

PLAN

Aim: I will be studying the resistance of wire, to gain a better understanding of resistance and connecting topics.

Resistance is caused when electrons flowing along a wire[1] collide with the particles of the wire.  These collisions slow down the electrical flow which causes resistance.

The reason why metals are such good conductors is because they contain free electrons.  The amount the electrons are able to move about depends on the arrangement of atoms within the metal.  E.g. copper has a structure allowing free and easy movement of electrons, in contrast with iron which does not.  The amount that the structure of the metal slows down the electrons is the resistance.

Good conductors have low resistance; bad conductors have high resistance.  This is why it is

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Middle

Turn on power pack and set it so that the voltmeter reads 0.1volts.Record current shown by ammeter.Increase voltage to 0.2volts, 0.3volts, 0.4volts and 0.5volts.  (This is because when the resistance is calculated [=V/I] there will be 5 readings recorded and it will be possible to take an average resistance.)Repeat steps 1-4, varying wire length in intervals of 10cm.

Fair Test

Ensure all control variables are kept constant.

Measure length of wire accurately each time.

Record current readings neatly to avoid miscopying when writing up experiment.

Risk assessment

Take care if the wire gets hot due to the transfer of electrical energy into heat energy.

Do not get the power pack or the wires wet.

Be careful when cutting the wire.

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Conclusion

class="c3">0.20

0.26

0.33

1.67

1.54

1.50

1.54

1.52

1.55

50

0.1

0.2

0.3

0.4

0.5

0.07

0.15

0.22

0.30

0.38

1.43

1.33

1.36

1.33

1.32

1.35

40

0.1

0.2

0.3

0.4

0.5

0.09

0.18

0.26

0.36

0.44

1.11

1.11

1.15

1.11

1.14

1.12

30

0.1

0.2

0.3

0.4

0.5

0.1

0.21

0.32

0.43

0.54

1.00

0.95

0.94

0.93

0.93

0.95

20

0.1

0.2

0.3

0.4

0.5

0.15

0.26

0.40

0.54

0.67

0.67

0.77

0.75

0.74

0.75

0.74

10

0.1

0.2

0.3

0.4

0.5

0.17

0.34

0.50

0.68

0.85

0.59

0.59

0.60

0.59

0.59

0.59

Obtaining Evidence

The results table above shows that I tried to take voltage and current measurements as precisely as possible by taking five different current readings from five similar low voltages which enabled me to take an average resistance from five different resistance readings per length of wire.

All of the measurements taken are relevant to the experiment, as it is necessary to record the voltage and the current across a resistor in order to calculate its resistance, given

Resistance = Voltage

               Current


[1] (The current)

...read more.

This student written piece of work is one of many that can be found in our GCSE Electricity and Magnetism section.

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