• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Investigating weather the length of a wire affects the resistance.

Extracts from this document...

Introduction

Doha Salameh        Physics coursework

11JCU               Mr Harris

GCSE Science Coursework Investigation

Electricity

Investigating the resistance of a wire

Introduction

I am investigating weather the length of a wire affects the resistance.

The main factors that affect the resistance of a wire are length, thickness, material of wire, voltage and temperature. Resistance occurs in all parts of the circuit, that is when particles collide with something opposing it therefore this will slow down the flow of electric current. George Ohm, a German schoolmaster stated that the relationship between the length of the wire and the resistance should be directly proportional, which means that if the length increases then the resistance must also increase. To calculate the resistance of a wire you divide the current into the voltage. R (ohms) = V/A.

Planning

 I am going to be doing two experiments for this investigation. The first will be just to test if the circuit works and the second experiment is the main investigation, which is to find out weather the length of a wire affects the resistance. Circuit 1 is the circuit that I will be applying for the investigation. Circuit 2 is the trial experiment, to test if the circuit works.

Diagrams

Equipment

  • Meter Ruler
  • Wire (100cm)
  • Power Pack
  • Ammeter
  • Volt Meter
  • 2 Crocodile Clips

Method

...read more.

Middle

0.18

0.18

60

0.21

0.22

0.21

0.21

50

0.22

0.23

0.22

0.22

40

0.23

0.24

0.23

0.23

30

0.25

0.25

0.24

0.25

20

0.26

0.25

0.25

0.25

10

0.19

0.26

0.25

0.25

Results table for current

Distance in cm

Voltage (1) - V

Voltage (2) -V

Voltage (3) -V

Average- V

100

1.95

1.98

2.03

1.95

90

1.89

1.9

1.77

1.77

80

1.87

1.74

1.7

1.74

70

1.46

1.57

1.43

1.46

60

0.14

1.42

1.38

1.38

50

0.98

1.25

1.21

1.21

40

1.02

1.04

1.03

1.03

30

0.55

0.81

0.8

0.8

20

0.46

0.53

0.55

0.53

10

0.44

0.51

0.46

0.44

From these results, I observed that as the distance decreases the current increases.

Results table for voltage

...read more.

Conclusion

Evaluation

This investigation was mainly to fid out weather the length of the wire is proportional to the resistance. My results were accurate because I did not come out with any anomalous results that don’t follow the particular pattern; and because I repeated the experiment, more than once to result with results that are more accurate. My results also support the prediction that I stated (as length increases the resistance increases), which is another factor that supports how successful the experiment was.

       There were things that might of affected the amount of current flowing and that is an increase in temperature because this will not make the experiment a fair test. To solve this problem, next time I could place the wire in cold ice to cool the wire down, therefore this will reduce the amount of resistance. Another factor that may have affected the fairness of the experiment is the measurements of the wires because the lengths might have not been accurate.

     If I was to repeat this experiment, again I would like to investigate weather the material of the wire affects the resistance.

...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. Physics Coursework Investigating Resistance of wires and its relationship to length.

    the results do not show anything in particular which told me that Constantin would not be a good material to use because the results would be bland and not of proved anything. So I decided to use Nichrome as my material.

  2. Length vs Resistance

    Equipment: * A wire board * Voltmeter * Ammeter * Crocodile clips * A chosen thickness and length of Constantan wire * Thermometer or other temperature sensor However we cannot test this factor in our investigation since we do not have the equipment to keep the temperature the same and

  1. Resistance Coursework

    A thinner wire also means more resistance. Resistance is known to be inversely proportional to the cross- sectional area (diameter). I.e. if the diameter is increased, the resistance decreases. A wider wire means less chance of the free electrons having collisions into atoms and losing energy.

  2. Planning Experimental Procedures

    * I used 2 different ammeters, analogue and digital. I did this to be as accurate as possible. By using 2 different ammeters I was exact. After I had read both of the metres, I found out the amp average by adding them together and dividing by 2, I did this to decrease the effects of anomalous results.

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