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To investigate How the Length of Wire affects its Resistance.

Extracts from this document...

Introduction

Coursework:

“How the Length of Wire affects its Resistance”

Aim

To investigate How the Length of Wire affects its Resistance.

Hypothesis

 I predict that if “the length increases then the resistance will also increase in proportion to the length”. I think this because the longer the wire the more atoms and so the more likely the electrons are going to collide with the atoms. So if the length is doubled the resistance should also double. This is because if the length is doubled the numbers of atoms will also double resulting in twice the number of collisions slowing the electrons down and increasing the resistance.

The diagrams below backup what I have written above;

image00.png

                                    Long Wire                                                       Short Wire

image04.png

Flow of Current              Wire Particles (Resistance)image05.png

The diagram shows that if the wire is longer the same amount of current has to pass through a longer distance of space, and in a longer piece of wire there will be more atoms in the way increasing the resistance.

...read more.

Middle

image07.pngimage01.png

image02.png

image03.png

Results

Set 1

Length (CM)

Current (I) (Amps)

Voltage (V) (Volts)

20

0.69

1.53

40

0.41

1.70

60

0.29

1.78

80

0.21

1.84

100

0.17

1.80

Set 2

Length (CM)

Current (I) (Amps)

Voltage (V) (Volts)

20

0.67

1.50

40

0.39

1.67

60

0.26

1.46

80

0.23

1.80

100

0.19

1.85

Set 3

Length (CM)

...read more.

Conclusion

If any mistakes were made they were probably caused by human mistakes for example when writing down the readings from the voltmeter or the ammeter I could have made a mistake.

The temperature which the wire was at may have not been constant through out the experiment which may have caused the resistance to increase or decrease.

The ammeter or the voltmeter may have not been calibrated to exactly zero giving me inaccurate results.

To find out what other variables affect the resistance of wire not jus the length I could look at other variables for example:

  • The type of wire
  • The metal from which the wire was made
  • The thickness of the wire
  • The temperature of the wire

Another experiment that I could have done that would make the experiment fairer was to keep the wire under a constant temperature. The circuit would be the same but the wire would be in an atmosphere where the temperature wouldn't affect the resistance.

...read more.

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Here's what a star student thought of this essay

4 star(s)

Response to the question

Overall a good essay. It explains the concept of resistance fairly well, but some of their statements are limited in the scientific depth they go into and this should be improved upon throughout. Their conclusion and evaluation are very well ...

Read full review

Response to the question

Overall a good essay. It explains the concept of resistance fairly well, but some of their statements are limited in the scientific depth they go into and this should be improved upon throughout. Their conclusion and evaluation are very well done relating to the question set well.

Level of analysis

Their explanation of resistance and predictions are good, but the diagrams do not sum up well what they want to explain. The two different diagrams are not accentuated enough to explain their meaning well. The shorter wire just seems to have as many atoms as the longer wire thus not demonstrating their point very well. Their method is outlined clearly but some points need to be expanded upon to gain true clarity of their meaning. A diagram would also have been helpful at this stage rather than later. They identify factors which could affect the experiment which is good as this shows deeper understanding of the experiment and would make their results more reliable but again the points need expansion as they are not explained well. The evaluation and graph analysis are very well done outlining a number of factors and improvements.

Quality of writing

Punctuation, grammar and spelling done to a good standard mostly. Slight grammar problems in places. Format of the essay is good and the essay is easy to read and clearly set out.


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Reviewed by skatealexia 14/09/2012

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