• 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

To find out the effect of length on resistance.

Extracts from this document...

Introduction

image00.pngimage01.png

image10.png


CONTENTS

PLANimage20.png

image30.png

  • AIM PAGE 1
  • PREDICTION PAGE 1
  • EXPLANATION PAGE 1
  • DIAGRAM PAGE 1
  • EQUIPMENT PAGE 2
  • MEASUREMENTS PAGE 2
  • OHM’S LAW PAGE 2
  • FAIR TEST PAGE 2
  • CIRCUIT DIAGRAM PAGE 3
  • TRAIL EXPERIMENT PAGE 3
  • RESEARCH PAGE 4

OBSERVINGimage37.png

image43.png

  • SAFETY PAGE 5
  • REASURANCE  PAGE 5
  • RESULTS  PAGE 5

ANALYSING

image46.pngimage45.png

  • EVALUATING RESULTS PAGE 6
  • AVERAGES PAGE 6
  • LINE GRAPH 1  PAGE 7
  • LINE GRAPH 2 PAGE 8
  • LINE GRAPH 3 PAGE 9
  • EVALUATING GRAPHS PAGE 11

EVALUATION

image47.pngimage02.png

  • CONCLUSIONS PAGE 11
  • ANOMOLOUS RESULTS PAGE 11
  • EXSTENTION EXPERIMENT  PAGE 12

AIM: To find out the effect of length on resistance.

Possible things that could affect the resistance of a wire are the material the wire is made from, voltage across it, the current flowing through it, the magnetic field close to it, the colour of the wire could determine the resistance, the width, the temperature and, finally, the length.

The one thing I am going to investigate is the length.

PREDICTION

I predict that if I increase the length of the wire then the resistance will increase.

EXPLANATION

I think this because the more material the electric current has to go through, the more resistance there will be. I can relate to this by imaging a tube with water in it: -

If the tube is tilt diagonally, the water will flow but I have to predict whether it would flow faster in a smaller tube at a set height or in a longer tube at the same height.

...read more.

Middle

image26.png

image32.pngimage28.pngimage31.pngimage29.pngimage29.pngimage31.png

image34.pngimage24.pngimage33.png

This will give me the readings I need. The test wire will, obviously, be the wire I test. The variable power supply will power the circuit with the switch on to make a complete circuit.

The experiment can prove my prediction because I think the resistance will increase and if I am right the results will prove this. It will do so by myself taking a measurement of the ammeter and the voltmeter with every 5 centimetres of the test wire and then, using the equation, work out the resistance and compare the results with my prediction.

I did a trial experiment and I set up the equipment as displayed for my final experiment. I did this because it will help me in my final experiment; I know exactly what equipment to get how to set it up and it will be done at a quicker rate than if I was to go straight to my final. Not only that, but it has reassured me on my measurements I decided to do (5cm-50cm with 5cm difference between each.)

These are the results for my trial experiment:

Wire length

Volts

Amps(current)

Resistance

5

1.00

0.75

1.33

10

1.23

0.55

2.27

15

1.40

0.39

3.85

20

1.25

0.30

4.17

25

1.35

0.25

5.40

30

1.40

0.22

6.36

35

1.40

0.18

7.78

40

1.40

0.16

8.75

45

1.40

0.15

9.33

50

1.45

0.14

10.00

In my trial experiment, it appears the voltmeter exceed 1.45 volts from the volt unit. The results and this conclusion show that there are only minor increases from 1 volt at what I originally began with and 1.45, the final result.

...read more.

Conclusion

As an extension to this experiment I would see if the width of the wire affects the resistance. I would also predict that the width would affect the resistance and that the thicker the wire, the bigger the resistance. I think this because the thicker the wire means that there is more room for the current to flow and accelerate. Not only that but it lets more current in and therefore a higher resistance using the same equation:

                          VOLTAGE

 RESISTANCE = image11.png

                          CURRENT                                                      

Then I would proceed with the experiment as I did in the ‘length against resistance’ experiment following the same instructions and using the same plan.

Kelly Duggan                                                          NDO physics coursework resistance 2/1/03

...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. To find out what happens to the efficiency of a motor as I change ...

    We made sure to keep all of the runs the same by conducting them under exactly the same conditions, so we can be relatively confident about the accuracy of our results. However, the results are definitely unreliable, though this is mostly due factors beyond our control which shall be looked at later.

  2. An experiment to find the resistivity of nichrome

    Metals conduct electricity at all temperatures, but for most metals the conductivity is best at low temperatures. Resistance in electricity, property of an electric circuit or part of a circuit that transforms electric energy into heat energy in opposing electric current.

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

    My overall method was extremely efficient at delivering suitable results and I got very few anomalies, which I could rub out by working out an average. My conclusions are supported by scientific knowledge and my formula is also scientifically correct.

  2. How does length and width affect resistance

    I also predict that if the length increases then the resistance will also increase in proportion to the length. I think this because as I know from my scientific knowledge that: Electric current is the movement of electrons through a conductor.

  1. Investigating The Effect Of Resistance On A Capacitor Circuit

    0.184 70.5 0 0 0 0.014 0.184 71 0 0 0 0.014 0.177 71.5 0 0 0 0.014 0.177 72 0 0 0 0.014 0.17 72.5 0 0 0 0.014 0.17 73 0 0 0 0.014 0.17 73.5 0 0 0 0.014 0.163 74 0 0 0 0.014 0.155 74.5

  2. Construct and test an anemometer.

    Once a constant voltage was being produced, I could then adjust the stroboscope to produce more or less flashes per minute, until the cups appeared frozen in motion. To make this easier the practical was done in a dark room so the stroboscope was the only source of light.

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