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Resistance Of A Wire.

Extracts from this document...

Introduction

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GCSE Physics Coursework:

Resistance Of A Wire

by

Alex Hewitt 10MG

10DM1

Mr. McBirnie

The Resistance Of A Wire

For my GCSE physics coursework I intend to investigate the resistance of a wire and specifically how the length of the wire affects the resistance.

Firstly I shall do some initial research to determine what resistance is, what affects it in general and anything else that I think will be relevant to my investigation.

Then I will plan and carry out my experiment, recording the results.

I shall then collect and analyse the results, drawing a logical conclusion from the results obtained.

Lastly I will do an overall evaluation of my investigation.

Research

What is resistance?

The definition of resistance in Hutchinson’s Encyclopedia:

“In physics, the property of a conductor that restricts the flow of electricity through it, associated with the conversion of electrical energy to heat; also the magnitude of this property. Resistance depends on many factors, such as the nature of the material, its temperature, dimensions, and thermal properties; degree of impurity; the nature and state of illumination of the surface; and the frequency and magnitude of the current. The SI unit of resistance is the ohm (Ω).”

Metals conduct electricity because the atoms in them do not

...read more.

Middle

20.0

-0.86

-0.16

30.0

-1.13

-0.13

40.0

-1.37

-0.12

50.0

-1.5

-0.11

60.0

-1.61

-0.1

70.0

-1.72

-0.09

80.0

-1.81

-0.08

90.0

-1.93

-0.08

100.0

-1.96

-0.07

Table For Experiment 1  

Length

(cm)

Volts

Amps

10

-0.52

-0.18

20

-0.85

-0.16

30

-1.11

-0.14

40

-1.33

-0.12

50

-1.46

-0.11

60

-1.62

-0.1

70

-1.74

-0.09

80

-1.85

-0.08

90

-1.9

-0.08

100

-1.96

-0.07

Table For Experiment 2  

Length

(cm)

Volts

Amps

10.0

-0.79

-0.18

20.0

-1.09

-0.19

30.0

...read more.

Conclusion

To improve the investigations I could have studied the effect of applying more constant factors.

For example, I could have kept the current at 0.10 amps. I would have chosen this value so that I would be sure that this was the exact number, as opposed to using something like 0.01, which could also have more numbers after the second decimal place (e.g, 0.017).

I could use a different material instead of the metal alloy Constantan that was used, for example copper or iron, or even some none metallic conductor.

I could investigate how any of the other factors affect resistance.

The evidence collected, although there were some anomalies, was enough to support my prediction and the experiment did prove that the length is directly proportional to the resistance.

I know this because as the length increased the resistance increased also, proving my prediction correct.

...read more.

This student written piece of work is one of many that can be found in our GCSE Electricity and Magnetism section.

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