• 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 Wire Effect its Resistance?

Extracts from this document...

Introduction

How Does the Length of Wire

Effect its Resistance?

Planning:

Prediction/Hypothesis

From what I know of resistance and the way that it alters I predict that as you lengthen the piece of wire the resistance will increase also.  This is what I think will happen and I think this because I already know some information about resistance and have also done some preliminary work on this investigation.

In my circuit I will be using a power source which will create a potential difference between the two poles, one will be charged negatively while the other is charged with a positive charge. This is important to know as this effects the way electrons will move in a piece of metal wire.  In a metal wire piece there is an arrangement of atoms and electrons, which look something, like this:

However once a power source is added which has a negative pole and positive pole the electrons behave in a different manner with the electrons now all moving in one direction towards the positive pole of the power source, so now look like this:

This was not always known by scientists so they made a guess about the way electricity flowed, which was wrong as they said it, flowed positive to negative also known as conventional current.  Now however we know this to be wrong so can understand more information.

The diagram does show resistance in electrical circuits by the way some of the electrons a bumping into the metal atoms so causing a loss of energy and movement is hindered.

...read more.

Middle

0.86

0.95

2

0.9

1.75

1.94

3

0.9

2.63

2.92

4

0.9

3.51

3.9

5

0.9

4.39

4.88

6

0.9

5.25

5.83

7

0.9

7.55

50.33

8

0.9

7.38

52.71

Wire length (m)

Current (amps)

Voltage (volts)

Resistance (Ω)

1

0.15

1.39

9.27

2

0.15

2.79

18.6

3

0.15

4.17

27.8

4

0.15

5.55

37

5

0.15

7.05

47

6

0.15

8.55

57

7

0.15

10

66.7

8

0.15

11.4

76

From my repeat I can see that something has gone wrong so I will again do a repeat to see which of my results is correct.  Even though they both show my prediction to be correct I need to see if when the current is

...read more.

Conclusion

My results my not be totally accurate but they do show how resistance changes when varying the length of a piece of metal wire.  I do think that they are good enough to draw some firm conclusions from, as there are not any anomalous results which means that they are most likely to be correct.

The results I have gathered are reliable, as they do not show anything, which you would not expect, but they do show what happens to resistance when varying the metal wire’s length clearly so could be said to be accurate.

Even though this is said I could do more to make sure that the results are as reliable as possible by next time getting 8 metres of new wire and taking more thickness’ to make sure that they wire was the same width all the way along.

To find out more about this variable and how it effects the resistance you could do half metres and work out how the resistance varies between lengths so giving you a more advanced knowledge of how temperature effects resistance.  This could help if you wanted to find an equation linking resistance with length when not wanting to have to measure everything.


...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 alter the length of wire and measure the effect on the resistance.

    Resistance = voltage/current. Temperature If the wires temperature is higher, its atoms vibrate more, each one moving around a fixed centre. There is more chance of the electrons colliding with the vibrating atoms, so less current can flow. An increase in temperature increases the resistance of a wire.

  2. Investigating resistance when altering thickness of wire / length of wire

    In experiment 2, the length will need to be kept constant to make sure only the variables indicated are investigated to ensure a fair test. Metals conduct electricity because the atoms in them do not hold on to their electrons very well, and so creating free electrons, carrying a negative

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