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To investigate the effect of the length of a piece of wire on the resistance.

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Introduction

Abigail Male1st February 2002

image00.png

Aim:

To investigate the effect of the length of a piece of wire on the resistance.

Research:

Resistance gives us an idea of how easily electrons flow through a conductor it is the opposition of a material to the flow of electricity through it. It is caused by the internal structure of the material and its atoms, and tends to convert electrical energy in to heat. It is measure in ohms (Ω).  To measure resistance you must first find the voltage, which is the change in current between to certain points in a circuit. Electricity gives us a way of transferring energy and voltage is a measure of the energy available per coulomb of charge passing. Then you also need the current, which is measured in amps, electrical current as occur when there is a drift of charged particles (electrons or ions) in a particular direction.  However there are some effects of the current flowing through a wire, it tends to heat up.  

If you divide both the voltage and the amps you get the resistance.

...read more.

Middle

0.9

1.8

21cm

1.5

0.9

1.6

18cm

1.4

1.0

1.4

15cm

1.4

1.0

1.4        

12cm

1.2

1.1

1.1

9cm

1.2

1.1

1.1

6cm

0.9

1.5

0.6

3cm

0.5

1.7

0.4

Results Table 2

Length (cm)

Voltage (V)

Amps (A)

Resistance

30cm

1.5

0.7

2.1

27cm

1.4

0.8

1.8

24cm

1.4

0.8

1.7

21cm

1.3

0.9

1.4

18cm

1.2

1.0

1.2

15cm

1.0

1.0

1.0        

12cm

1.1

1.1

1.1

9cm

0.8

1.3

0.6

6cm

0.6

1.5

0.4

3cm

0.5

1.6

0.1

Results table 3

Length (cm)

Voltage (V)

...read more.

Conclusion

Resistance per centimeter

2.3 / 30 = 0.076image06.png

2.0 / 27 = 0.074image02.png

1.8 / 24 = 0.075

1.6 / 21 = 0.076

1.3 / 18 = 0.072

Evaluation

My results in my opinion are fairly reliable we have the odd result as with most experiments, however on the whole our results and graph show that the current is directly proportional to the voltage and that was our aim in the beginning.  Our graph is reliable despite the fact that only two results actually touch the line (this could be due to back readings off or a fault in our method) because all of our results follow the line and are very close to it.

Regardless of getting reliable results except a few anomalous results we could have improved our method by ensuring that we had the set amount of wire in between the clip, for example 30cm, because when you add the clips it takes of about 2 cm so we could all of the experiment with the wire 2cm longer.  Also as stated above in my research temperature has to remain a constant, which it was not because the smaller the wire got heat was lost so the resistance would be higher so maybe our lower results are not as reliable as the higher ones.

...read more.

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