• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month
Page
  1. 1
    1
  2. 2
    2
  3. 3
    3
  4. 4
    4
  5. 5
    5
  6. 6
    6
  7. 7
    7
  8. 8
    8
  9. 9
    9
  10. 10
    10
  11. 11
    11
  12. 12
    12
  13. 13
    13
  14. 14
    14
  15. 15
    15
  16. 16
    16
  17. 17
    17
  18. 18
    18
  19. 19
    19

The factors that affect the resistance of a wire

Extracts from this document...

Introduction

The factors that affects the resistance of a wire        Tom Pattle

The factors that affect the resistance of a wire

By Tom Pattle


Contents

Plan - Pg 4 ~ 11

Introduction - Pg 4

Background Knowledge – Pg4  ~ 7

Prediction – Pg 8

Method – Pg 9  ~ 11

Results - Pg 12 ~ 13

Analysis – Pg 14 ~ 16

A graph to show the resistance of a wire at room temperature – Pg 16a

A graph to show the resistance in a wire when kept at a constant temperature – Pg 16b

A graph to show the resistance in a wire when at room temperature and kept at a constant temperature – Pg 16c

Evaluation – Pg 17 ~ 18

References – Pg 19


Plan


Introduction

        The experiment that will be carried out is about the factors that affect the resistance of a wire using Nichrome 32SWG. When a current of 0.10 amps is passed through this wire, a resistance will form. The voltage will be measured, and using the following equation the resistance will be calculated:

Resistance = voltage ÷ current

(this equation is explained further on page  5)

By finding the resistance when the Nichrome is at different lengths and when the temperature is kept constant will show us the factors that affect the resistance of a wire.

Background Knowledge

        For this experiment to be successful, one of the four factors that effect resistance must be included in the experiment:

As the length of the wire increases, the resistance increases.

...read more.

Middle

The voltage travelling across the wire will then be recorded, and the power unit will be switched off.

The same process will then be repeated for 20cm – 100cm


Experiment Two

image08.png

  1. The Nichrome wire will be measured at 10cm and connected to the circuit via the crocodile clips, it will then be placed in the beaker of water,
  2. The power unit will be switched on,
  3. The variable resister will be set to the correct current by the reading on the ammeter,
  4. The voltage travelling across the wire will then be recorded and the power unit switched off.

        In order for the experiments to be carried out safely the following safety precautions must be adhered to:

  • The power unit must be turned off before touching any of the other pieces of equipment, and,
  • Eye protection must be worn at all times.

        Ten results will be taken with the wire increasing in length by 10cm each time; this will be repeated three times for best results and in the case of a result being anomalous.  

Fair Test

        To make sure the two experiments are fairly undertaken, the following must be done:

  • When doing experiment one the room temperature must not be changed dramatically – because temperature effects the resistance of the wire,
  • The current must be kept the same – so that each length of wire has the same amount of amps passing through it because  The same amount of amps will also be used for experiment two,
  • The power unit must be kept at the voltage (2 volts) – so that the current can be kept the same,
  • The amount of water in the beaker must be kept the same for experiment two – so that each length of wire is put in the same amount of water,
  • The temperature of the water must be kept constant (21 °C) – so that each length of wire is tested at a constant temperature.
  • The Nichrome 32SWG must not touch itself during the experiments – because it will affect the resistance of the wire.
...read more.

Conclusion

The wire could be supported by clips to stop it touching itself,A temperature reading could be taken regularly and noted to see if temperature was approximately the same. If the temperature was not the same, you could postpone the experiment until it was,Measure to water level more precisely using a burette,A more sensitive resistor could be used to keep the current the same (e.g. rotary resister).  

These more precise methods of carrying out the investigations would overcome the main problems to give a better table of results. Repeating the results for a 4th time could also help to improve the reliability and also dispose anomalous results.

        There are also some other experiments and techniques that could be used to improve and extend the assignment:

  1. The results could be taken over a wider range by increasing the length of wire,
  2. A number of different experiments could be carried out were the other three factors that affect the resistance of wire were studied. Cross-sectional area, different materials, diameter.
  3. Also, to extend the coursework, instead of changing the length of the Nichrome wire the current could be changed.

References:

  • EDEXCEL revision guide
  • Class notes
  • Coursework hand-outs

...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. Marked by a teacher

    Resistance Aim: my main aim is to investigate the factors that affect the resistance ...

    3 star(s)

    84.90 85.70 0.30 3 3.48 115.10 115.20 115.00 0.40 4 3.87 129.15 144.00 114.30 0.50 5 3.47 172.90 173.20 172.60 0.60 6 3.52 198.70 198.70 198.70 0.70 7 Average = 3.53 Resistance from graph 100cm and 75cm Gradient = y/x = 26.10/0.10 = 261 Resistance = 1/261 = 0.003831 x

  2. Peer reviewed

    What factors affect the resistance of Ni-Chrome wire?

    4 star(s)

    I think this will occur because as the length of wire doubles the electrons will bump into the atoms of the wire twice as much doubling the resistance. Basic circuit of experiment I am going to carry out an experiment using the circuit shown above as a guide.

  1. Discover the factors affecting resistance in a conductor.

    across a wire Current flowing through a wire Finding the resistance using the current and potential difference is known as the ammeter-voltmeter method. This circuit will allow you to record the current and the potential difference in Amperes and Volts in order to calculate the resistance: How this led me

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

    If this experiment had followed my prediction 40 turns would have held 106 grams. This one example is although very close to the predicted amount, it is not exact. Yet further down my table of results I found a much larger gap between the two results.

  1. investigating the factors that effect the resistance on a length of nichrome wire

    to find the thickness of one strand of wire without an advanced piece of equipment. I will find the length of 100 wires and divide it by 100. Circuits in series and parallel: Series - Chain Link: The Total resistance= R1+R2+R3 (RT)

  2. Factors which affect the resistance of a wire

    In order to make my results as accurate as possible I will straighten out the wire when I cut it so the length will be accurate. I will also take readings from my practical experiment three times and average out the average resistance of the wire so that it reflects on the most accurate result.

  1. Does Increasing the Length of a Nichrome Wire affect its Resistance

    it will be right at the start and end and not a couple of cm's out or in which will show on my graphs as error points. * Make sure the temperature of the wire is the same each time I change the length so if they are more hotter

  2. Investigating the factors that affect the resistance of a metal wire

    Ensuring that recordings of readings are taken clearly also improves the accuracy of the experiment. Method The basic steps of carrying out my experiment, to investigate how the length of a piece of wire affects the resistance, are very similar to how I conducted the preliminary work.

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