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

How does the length of a wire affect its resistance

Extracts from this document...

Introduction

Muna Ali-11K7

GCSE Coursework-Physics Ms Wainaina

How does the length of a wire affect its resistance?

Aim:

The aim of this investigation is to find out how the length of a wire affects its resistance in a circuit.

Introduction:

Resistance is the measure of how hard it is to get a current through a component in a circuit at a particular potential difference. Varying the resistance in the circuit can control the current through a circuit.

The greater the resistance the harder it is for the current to flow and the move energy that is converted to heat and light. Resistance is measured in Ohms (Ω).

Electricity is conducted through a wire, which also means in a wire, by free electrons. The amount and number of these free electrons depend entirely on the more material, meaning that the more free electrons there are, the better the conductor. Electrons that are free are given energy as a result of moving and colliding with other nearby free electrons. This also happens across a length of wire, which means therefore, that electricity is conducted. Resistance is the results of energy loss and heat. This involves the collisions between the free electrons and also the fixed particles of the metal, free electrons and other impurities from the metal. These electrons continually collide, and therefore these collisions result in converting some of this energy that the free electrons are carrying into heat. Therefore, the wire becomes hot.

In 1826, Georg Ohm discovered that:

...read more.

Middle

I then moved the crocodile clips to 20 cm so this length of wire could be measured.I recorded the current and the voltage for 20cm of wire from the voltmeter and ammeter.I then moved the crocodile clips to 10 cm so this length of wire could be measured.I recorded the current and the voltage for 10cm of wire from the voltmeter and ammeter.This was carried out three times for each length of wire so as the result could be much more accurate and an average could be calculated for the resistance.

Obtaining Results

Below are the results of how wire affects the resistance. Three different sets of results were collected, than an average result was calculated for the resistance. The resistance in each table was multiplied by 100 so as the results will be easier to calculate a trend in a line graph.

Test 1

Length

Current

Voltage

Resistance

Resistance x 100

100cm

1.03

0.10

0.097 to 3sf

9.7

90cm

0.93

0.08

0.086 to 3sf

8.6

80cm

0.94

0.07

0.077 to 3sf

7.4

70cm

0.95

0.07

0.073 to 3sf

7.3

60cm

0.96

0.05

0.052 to 3sf

5.2

50cm

0.96

0.04

0.041 to 3sf

4.1

40cm

0.97

0.03

0.030 to 3sf

3.1

30cm

0.98

0.03

0.030 to 3sf

3.1

20cm

0.99

0.02

0.020 to 3sf

2.0

10cm

1.02

0.01

0.009 to 3sf

0.9

Test 2

Length

Current

Voltage

Resistance

Resistance x 100

100cm

0.91

0.10

0.109 to 3sf

10.9

90cm

0.93

0.09

0.096 to 3sf

9.6

80cm

0.94

0.09

0.095 to 3sf

9.5

70cm

0.95

0.07

0.073 to 3sf

7.3

60cm

0.97

0.06

0.061 to 3sf

6.1

50cm

0.98

0.06

0.061 to 3sf

6.1

40cm

0.98

0.05

0.051 to 3sf

5.1

30cm

0.99

0.04

0.040 to 3sf

4.0

20cm

1.01

0.03

0.031 to 3sf

3.1

10cm

1.02

0.02

   0.021 to 3sf

2.1

...read more.

Conclusion

To make and investigate the resistance further, I should have used different wires and tested them fully. Whereas in the preliminary I took only one reading of three different wires, as do that I could familiarise myself with the investigation.

I could have also changed such aspects as mentioned in the fair test section, such as changing the temperature to find out also if temperature in any way affects the resistance. I could have also changed and varied the width of the wire, as I have already found out that length of wire does affect resistance and whether the width also affects it. I could have also tested out different wire such as nickel chrome, Constantine as in the preliminary results to find out different resistances of different wires.

I could have also, to make the investigation more accurate by measuring the temperature of the wire to find out whether different lengths of wires have different temperatures so as this may affect the resistance

Overall, I feel the investigation was a success, and I believe I have achieved my aim of finding out how the length of wire affects the resistance. This is, as the length of wires increases, so does the resistance also increases, due to more electrons colliding with each other.

Bibliography

  • OCR Science Double Award B Phase 2 Modules
  • Nelson Thornes “Physics For You”
  • www.gcsebitesize.com
  • www.howstuffworks.co.uk

...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. An in Investigation into the Resistance of a Wire.

    For example 50cm on the E32 wire has the resistance of 4.41 Ohms and in the length 100cm it has the resistance of 8.56 Ohms. This shows me that if I am going to investigate in the relationship between the length and the resistance I will need a larger range of lengths to get a more accurate result.

  2. Physics GCSE Coursework:Factors affecting the resistance of a wire

    This is shown in my diagrams below; Wire A is half the width of wire B, therefore because wire A has 20 atoms wire B will have 40. In this diagram the wire is (approx) half the width of the wire below and so has half the number of atoms,

  1. The resistance of wire.

    wweg egw esegegs ayeg egba neg kceg eguk. This coursework from www.essaybank.co.uk (http://www.essaybank.co.uk/free_coursework/812.html) Reproduction or retransmission in whole or in part expressly prohibited wwfb fbw esfbfbs ayfb fbba nfb kcfb fbuk: I will make this experiment fair by performing investigation on each variable one at a time as not to get the variable mixed up.

  2. Investigate the resistance of different wires and how at different lengths the voltage increases ...

    set out so I will know the electrons collide and how and why it affects the resistance. Resistance 'Resistivity is a measure of the material's ability to oppose the flow of electric current' The electrical resistance of a wire would be expected to be greater for a longer wire, less

  1. Investigating how the length of a Wire affects its resistance.

    (This has been touched on in the method). This would greatly increase the reliability of the experiment as we would only have the results that are correct (assuming that the cause of anomalous results was not present throughout the entire experiment).

  2. Investigate one or more factors affecting the resistance of metal wires

    Ammeter reading (I2) Resistance1 (?) Resistance2 (?) Volts Cm Amps Amps Ohms Ohms 3.0 10 0.88 0.90 3.41 3.33 3.0 20 0.54 0.54 5.56 5.56 3.0 30 0.39 0.39 7.69 7.69 3.0 40 0.31 0.30 9.68 10.00 3.0 50 0.26 0.25 11.54 12.00 3.0 60 0.22 0.21 13.64 14.29 3.0 70 0.19 0.19

  1. Does the length of the wire affect the resistance?

    thin wire it is showing us that the electrons coloured as red have little space to move about and will collide more with the wire, creating greater resistance. However if we look at the bigger circle i.e. thicker wire and the electrons it tells us that they have a bigger

  2. To investigate how the length (mm) and the cross-sectional (mm2) area of a wire ...

    This is due to the interactions or collisions between the atoms and the electrons in the wire. As the electrons flow through the wire, electrical energy is continuously lost through these collisions. In a relatively short piece of wire, the electrons do not have many collisions with the atoms, and therefore not much energy is lost.

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