• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

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

image00.png

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

...read more.

Middle

image01.png

0.7

image02.png

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

image01.png

28 swgimage02.png

10

image01.png

0.3

image02.png

image01.png

0.5image02.png

image01.png

0.7

image02.png

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

...read more.

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.

...read more.

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

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Electricity and Magnetism essays

  1. Electromagnetism - investigating what effect increasing the number of turns in a coil on ...

    I have done this freehand; therefore; the line of best fit is a curve. The line is, although it is not shown on the graph starts at the origin and becomes very shallow at the start, I feel it I shallow because the magnetism was not strong enough to start with and was having no affect on the domains.

  2. Free essay

    How the length of constantan wire affects the ressistance in a electrical circuit

    Plan- What do I keep the same? To insure a fair test in the practical I kept the voltage on the power pack the same which was five volts. I did this because I do not want to see the relation between voltage and resistance but I want the relation between the length of wire and resistance.

  1. Investigate how resistance can affect the amount of current flow.

    Each material has a characteristic resistance. For example, wood is a bad conductor because it offers high resistance to the current; copper is a better conductor because it offers less resistance. In any electric circuit, the current in the entire circuit is equal to the voltage across that circuit divided by the resistance of the circuit.

  2. Investigating Resistance in an electrical circuit

    Copper has a low resistance and is the most efficient after silver. Materials with high resistances have their purposes in some electrical circuits too. Nichrome (an alloy of 80% Nickel and 20% Chromium) is often used as a heating element in electrical devices.

  1. Investigating The Characteristics Of A Filament Lamp

    From these results the range of measurements needed could also be discovered. After carrying out the preliminary investigation, the best way to display the results from the main investigation itself would be to record each repeat into a simple results table, and then to work out the average current.

  2. Physical - Circuit

    As the water cools down the resistance drop again, this can show that temperature will affect the flow of charge as well. Analyse Table 1: This table shows about the thinnest wires used in the experiment, Constantan wire with diameter of 0.45mm. First Tried Second Tried Third Tried Length (centimetres)

  1. Investigation on Photovoltaic Cells

    To conclude, my graph is showing that as the surface area increases the voltage produced also increases but when the surface area gets to a certain point, in this case 28cm� the voltage being produced levels of. In reality, the sun is a great distance away from building roof tops

  2. Determining Voltage, Resistance and Current in a Parallel, Series and Series-Parallel Circuit.

    Connect 2 bulbs together as show in the diagram below. 1. Measure the voltage and resistance of each bulb. 2. Measure the current in the circuit Results Series Resistance Measurement Using Multimeter Bulb 1 Resistance = 3.90 ? Bulb 2 Resistance = 3.80 ? ? Total Resistance = 3.90 +

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work