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Calculate the level of Resistance within A piece of wire at different lengths.

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Introduction

Science G.C.S.E course work

Timothy Samson 11RW

Calculate the level of Resistance within

A piece of wire at different lengths

AIM: I am trying to find out what the level of resistance would be on a piece of wire at different lengths as the current passes through

PREDICTION: I predict that each time I change the length of the wire i.e. 0-10, 0-20cm etc the voltage will increase, which means the resistance will increase to.

        I think this because I know that current is a flow of electrons, and the piece of wire is a solid which is dense. In a short piece of wire there are not many atoms for the current to pass thought so the resistance is small. But as the piece of wire increases in length so dose the number of atoms within the wire, therefore the greater the resistance.

        To back up my prediction I have found a quote from the new edition physics book page 98, it reads:

                “The resistance of a resister stays the same providing the temperature

Dose not change, but in a lamp the filaments dose change so its resistance changes.

...read more.

Middle

RESULTS: These are the measurements I made; I can also show these results on graph

Length (cm)

10cm

20cm

30cm

40cm

50cm

60cm

70cm

80cm

90cm

Current (amps)

1.05

0.95

0.85

0.73

0.67

0.61

0.57

0.53

0.48

Voltage (volts)

1.35

2.5

3.45

4.15

4.7

5.12

5.68

6

5.8

Resistance (onus Ω)

1.28

2.63

4.05

5.68

7.01

8.39

9.96

9.96

12.08

SET OF RESULTS NO. 1

SET OF RESULTS NO.2

Length (cm)

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Conclusion

EVALUATION

MY RESULTS: my results are good enough to answer the question I was investigating because, the results that were taken prove my theory true, which was as the length increased the higher increase of the resistance, this was proven because as i changed my length i.e. 10cm to 20cm etc he resistance became bigger.

MEASUREMANTS: My measurement are accurate because all of the measurements

 (bar 1 ) fitted the line of best fit and it was proven that there was a strong correlations.

ODD RESULTS: The results that did not fir the pattern were in the second set of results at the length of 40cm, the resistance was 5.91Ω and this did not fit the line of best fit

I THINK THIS BECAUSE: Maybe the result was caused by an inaccurate reading from the ammeter or voltmeter.

MY PLAN/GOOD RESULTS: My plan gave me good results because I used a well designed voltmeter/ammeter.

My calculations were to 2 decimal places and I took two sets of result to compare them.

HOW I COULD MAKE IT BETTER: I could make my experiment better by using a real quality ammeter and voltmeter and maybe I could change the voltage passing thought the wire. Or even I could change they type of wire and compare the results with Nichrome

...read more.

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