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# We are investigating how the current flow through a wire, which is part of an electrical circuit, can be altered. In doing this the resistance of the wire will be measured.

Extracts from this document...

Introduction

## Introduction

We are investigating how the current flow through a wire, which is part of an electrical circuit, can be altered. In doing this the resistance of the wire will be measured. It’s an extension of earlier GCSE work using cells, lamps, ammeter, voltmeter and variable resistors.

There are two types of circuits, series and parallel. In class experiments we found out that for:

• Series circuits- more lamps in series, the lamps become dimmer and the current flow through them becomes less.
• Parallel circuits- more lamps in parallel, the lamps remain equally bright and the total current splits equally between each branch of the circuit.

Something has happened to the resistance in each type of circuit.

Series circuit = More lamps = More resistance = Less current.

Parallel circuit =More lamps = More current = Less resistance.

This is because as the resistance of the lamp increases, the temperature of the filament wire also increases; therefore the particles in the wire vibrate more and make it harder for the electrons to pass through.

## Background Information

The and materials I have used are:

Class notes

AQA GCSE science

CGP GCSE physics

## Prediction

Middle

0.7

0.09

0.15

0.20

0.30

0.30

0.28

0.29

20

0.16

0.26

0.37

0.52

0.52

0.52

0.52

30

0.23

0.38

0.53

0.76

0.76

0.76

0.70

40

0.29

0.50

0.70

0.96

1.00

1.00

0.98

50

0.37

0.62

0.86

1.23

1.24

1.22

1.23

60

0.44

0.73

1.02

1.46

1.46

1.45

1.43

70

0.58

0.98

1.37

1.93

1.96

1.95

1.94

80

0.65

1.09

1.53

2.16

2.18

1.70

2.01

90

0.67

1.12

1.56

2.23

2.24

2.28

2.25

100

0.73

1.23

1.68

2.43

2.46

2.40

2.47

 Material Length of wire (cm) Current  A      B        C Voltage  A        B       C Resistance  A        B       C Average 28 swg 10 0.3 0.5 0.7 0.17 0.27 0.41 0.56 0.54 0.58 0.56 20 0.32 0.53 0.73 1.06 1.06 1.04 1.05 30 0.45 0.76 1.07 1.50 1.52 1.52 1.57 40 0.55 0.93 1.29 1.83 1.86 1.43 1.70 50 0.69 1.15 1.61 2.30 2.30 2.30 2.30 60 0.83 1.38 1.93 2.76 2.76 2.76 2.76 70 0.83 1.42 1.96 2.76 2.84 2.80 2.80 80 0.98 1.66 2.38 3.26 3.32 3.37 3.32 90 1.25 2.12 2.94 4.18 4.24 4.20 4.20 100 1.42 2.53 3.29 4.73 4.66 4.70 4.69
 Material Length of wire (cm) Current  A        B       C Voltage

Conclusion

Evaluation

After doing this experiment, I have come up with a reliable set of results.

Even though I have achieved a good set of results there are obviously going to be errors, which I have made that could affect the investigation. The errors that I came across were, the wire was very hard to get straight and had bends, the voltmeter was only accurate to two decimal places so the voltage was flickering which made it hard to tell what the exact number was. To make my accuracy better we could have done more than ten lengths, done each result more than three times, used ammeter and voltmeter sensor. We could also have used different cross sectional areas or use different materials.

I think my graph was good to look at but there are still one or two anomalous results which could have been caused by accuracy measuring instruments which we could have improved.

To support my conclusion I could do some extra work like testing more materials to see what other materials it would work with. We could test more length to see if the graph will rise in proportion or will there be a point where the graph will bend and the resistance will not go any higher.

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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