• 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. Free essay

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

    when a current flows, the electrons starts to move * Sometimes they get slowed down when they bump into big positive ions. * This is called Resistance. Resistance can be calculated by the following formula: Resistance, R= p.d across the wire (V)

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

    Range As I am only finding out what effect the number of coils has on an electromagnet, I will not be changing the current that I use, therefore I will keep this at 3A at all times. I found out this range from my pretest, I wanted to go up

  1. 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)

  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 Resistance Of A Wire When The Diameter Of The wire is altered.

    Therefore it is important to keep the material the same throughout the experiment unless a different material is used to check if the conclusion or theory works for all materials. If different materials are used throughout the investigation, it will affect the results.

  2. Investigate the resistance of a wire when the length of the wire is altered.

    The investigation will be done at room temperature. 2) Diameter of wire the thinner the wire, the larger the resistance. This is because the thinner the wire is, the fewer paths there are for electrons in the wire therefore there are more collisions with metal ions and the harder it is for current to flow.

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

    + 2.60 = 5.30? Power Supply Voltage = 5.73V Voltage of Bulb 1 = 5.62V Voltage of Bulb 2 = 5.59V Equivalent Resistance of Parallel Circuit using two Bulbs: Req = Req = Req = 1.32 ? Series ?Parallel Resistance Measurement Using Multimeter Bulb 1 Voltage = 2.80V Bulb 2

  2. Aim: I am going to carry out an investigation to find how the resistance ...

    This is a sign of Resistance. I have chosen to keep the voltage at 12 volts as this is the highest number of volts possible on the power pack. Using a higher voltage In, means that I will get higher results for Vout.

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