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Investigating the factors which affect the flow of electricity

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Introduction

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Jenni Fisher 10.1

There are a number of ways in which resistance can be affected, some of which are the length of the wire. This can affect the resistance because if we increase the amount of wire, the current has to travel through more therefore increasing the resistance. Another way in which resistance can be affected is the thickness of the wire. If the wire is very thin, the current wont have as much room to pass through causing it to “struggle” through the wire, therefore causing ore resistance.

  Changing the metal, can also cause resistance, due to some metals are better conductors of electricity then others.

   To cause my resistance, I have chosen to change the length of the wire through out the experiment, can also cause resistance, due to some metals being better conductors of electricity then others.

   To cause my resistance, I have chosen to change the length of the wire through out the experiment.

Predictions:

...read more.

Middle

 To make this experiment a fair test we must ensure that:

  • We use the same current through out the experiment.
  • The power pack is turned off between readings. (So there are no false results)
  • Always have a constant heat.
  • Everything as to be exactly the same throughout the experiment. E.g. Same wires, same resistor, same ammeter. (The only thing that should be changed is the wire on the resistor.)

Results Table:

Results 1:

Length

Ammeter readings

Voltmeter

100 cm

0.31

4:00

90 cm

0.36

4:00

80 cm

0.38

4:00

70 cm

0.40

4:00

60 cm

0.47

4:00

50 cm

0.65

4:00

 40 cm

0.81

4:00

30 cm

1.07

4:00

20 cm

1.65

4:00

The set of results for “results 1” was more or less the same.

...read more.

Conclusion

Evaluation:

In my opinion my results are fairly accurate, and I didn’t get any results that didn’t fit my set pattern. I found recording the results was very easy, and I had no difficulties. The only fault was the setting up of the experiment. I had connected everything right, but for some reason the ammeter was reading “minus”. We changed the power pack, the ammeter, and the voltmeter, but the ammeter was still reading “minus”. The only left to do was to check all the wires. We took each wire out one by one till eventually we found the loose connection.

       The only thing I think id change about the experiment, was to maybe turn off the power pack a bit sooner, because as I said earlier, towards the end the results seemed to jump drastically.

...read more.

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