• 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. Resistance of a Wire Investigation

    Results As shown below there is only a range of five readings, which start to show a pattern, that the best fit line is directly proportional? To see if this trend carries on, I will widen my main experiment and use a 100cm length of wire, I will also take the readings every 5cm and not 10cm.

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

    with the atoms of a wire and these collisions slow down the flow of the electrons causing resistance. I also predict that as the length doubles so will the resistance because it is directionally proportional because when the length increases the number of atoms will increase meaning that there will

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

    Prediction I predict that if I double the length of the wire then the resistance will also double. I mean that if I double the length of the wire there will be twice as many electrons in the wire to carry the charge.

  2. The resistance of wire.

    I will vary the Wire by placing a crocodile clip at different lengths down the wire in order to vary the lengths. VpCh from VpCh essay VpCh bank VpCh co VpCh uk I will use the results of the investigation to answer the question by placing the results into a

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

    This is why a large diameter and small current will be used. (SWG 28 and current 0.25A) The aim of the preliminary experiment was also to see all of the possible values of current that could be used without heating i.e.

  2. Discover the factors affecting resistance in a conductor.

    Draw a line of best fit through each set of results, and label each line with the according diameter. Overall, have structured my method by aid of my scientific knowledge to produce precise and reliable measurements. As long as the temperature remains constant, and the shape of the carbon putty

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

    Prediction: I predict that as the cross-sectional area of the wire widens and increases the resistance will also increase because it is proportional to the cross-sectional area. If the cross-sectional area doubles or trebles, so will the resistance accordingly. Again I can use my preliminary work as a source and

  2. Find out how the length and width affect the resistance of a graphite track.

    As the resistors are: ohms m2 M?? Therefore the value of the constant is L = ohms X meters The reciprocal of this equation is given for the answer. Therefore, having more current with the same battery voltage means that the resistance has decreased. Planned Procedure 1.

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