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To see how the length of a wire will effect it’s resistance.

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Introduction

AIM:

To see how the length of a wire will effect it’s resistance.

RESISTANCE:

Resistance occurs when the electrons travelling along the wire collide with the atoms of the wire.
These collisions slow down the flow of electrons causing resistance. Resistance is a measure of how
hard it is to move the electrons through the wire.

PREDICTION:

I predict that if the length gets longer then the resistance gets higher and if the length gets shorter then the resistance gets lower.

METHOD:

The connections and the voltage on the power pack were kept the same.

The crocodile clips on the wire and the position on the variable resistor were changed.

1- The apparatus was set up.

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Middle

5- Calculated the average of the three.

6- Using the averages (and R=V/I), calculated the resistance.

7- Repeated steps 1-6, reducing the length of the wire by 10cm each time, i.e., 100, 90, 80….until 10cm.

The things observed were the readings on the amp meter and voltmeter and recorded them.

It was kept a fair test by keeping the wire still and changing the position of the variable resistor 3 times by quite a long distance– beginning, middle and end of it.

The test was not repeated but to make it more accurate the position on the variable resistor was changed three times.

Sources of information used to help were the internet, a dictionary, the internet and some books.

CONCLUSION:

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Conclusion

The observations and recorded results at some points weren’t accurate, the reading on amp/voltmeter kept flashing to two numbers with a 0.01 difference, so we had to round it up.

The averages would have been a bit more accurate if the position on the variable resistor had been changed a few more times.

There was one anomalous result. This result should not count as one to help the experiment along. This could’ve appeared because the wire moved or the average is inaccurate.

The method could be improved by using different types of wire as well, e.g., copper.

The method could be extended by changing the variable resistors position five times rather then three.

...read more.

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