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Using Ohms Law of Factors Which Affect the Resistance of a Wire.

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Introduction

Using  Ohms Law of Factors Which Affect the Resistance of a Wire

PLAN

    I will be investigating the three factors, which affect the resistance in a wire.  These are:

  • The length
  • The width
  • The material based on the conductivity.

*Temperature is also a factor of the resistance in the wire but more accurate apparatus will be needed to perform this, therefore I won't be testing temperature.

I will then be able to gain information see which properties produce the highest and lowest resistance.  

HYPOTHESIS

From scientific knowledge I predict that the wires, which will give the highest resistance, are the longest wire, the thinnest wire and the most conductive material wire.  This also means that these would have the highest pd. as

I/V=      and if the resistance must increase the p.d needs to be higher to maintain this.    

If you were to imagine students trying to get through a corridor this could be compared to electrons flowing through a wire.  The longer the corridor is the further someone will have to travel and the thinner it is the less freely students can travel through smoothly.  

...read more.

Middle

5

0.26

0.02

0.08

10

0.26

0.06

0.23

15

0.25

0.07

0.28

2nd Results

CURRENT (I)

P.D (V)

RESISTANCE ( )

Type of Metal

Constant: 15cm & 26swg

Constantine

0.26

0.10

0.38

Nichrome

0.25

0.04**

0.16**

Thickness (swg)

Constant: 15cm & Nichrome

Small      : 22

0.26

0.09

0.35

Medium : 26

0.24

0.22

0.96

Large     : 28

0.23

0.33

1.43

Length (cm)

Constant: 26swg & Nichrome

5

0.25

0.02

0.08

10

0.25

0.05

0.2

15

0.25

0.09

0.36

3rd Results

CURRENT (I)

P.D (V)

RESISTANCE ( )

Type of Metal

...read more.

Conclusion

EVALUATION

    I think my method did give reliable results.  I had made sure that constants were maintained and variables had been done.  I had written down everything from setting up the experiment to drawing out results as a graph.  I could have specified what graph I would do to be more prepared.

As I mentioned before there was an anomalous result of voltage therefore causing an odd result of resistance.  I had noted this down that as it was part of my method to write down the first result that I read on the voltmeter to keep a fair test.

     I found that I did have enough correct results to draw a conclusion.

To achieve a better quality of results I would have to carry out the fair test further.  To take it a step further I should also use a rheastat (variable resistor) in an experiment to vary the resistance.  I would also use more products to test on rather than just two and three to achieve a clearer reading.  

I must also do extra research or ask advice from the teacher to attain an even reliable result.

...read more.

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