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"Finding the resistance of nickel chrome wire by calculating the current".

Extracts from this document...

Introduction

GCSE Physics

“Finding the resistance of nickel chrome wire by calculating the current”

N.B: My results in these experiments are shared with my classmate, John Morgan, as we worked together on this investigation.

Introduction

This experiment has been set up in order to find the resistance of a nickel chrome wire when a current is passed through a series circuit. The resistance is calculated by using Ohm’s law of:

Resistance = Current / Voltage

We will also connect a voltmeter in a parallel format across the nickel chrome wire, which will tell me the reading across the nickel chrome wire, rather than if it was included in series with the rest of circuit, it would give us the reading of the whole circuit, rather than what we need: the voltage of the nickel chrome wire.

Variables

In this experiment, my input variables are:

  1. The length in which we measure the current and voltage at (to then calculate the resistance using Ohm’s law)

My output variables are:

  1. Current
  2. Voltage

Prediction

...read more.

Middle

Resistance

10cm

3.03

2.55

1.19

20cm

3.81

1.68

2.27

30cm

4.17

1.26

3.31

40cm

4.40

1.01

4.36

50cm

4.59

0.81

5.67

60cm

4.72

0.73

6.47

70cm

4.83

0.65

7.43

80cm

4.89

0.58

8.43

Set 3

Length

Voltage

Current

Resistance

10cm

2.74

2.34

1.17

20cm

3.45

1.60

2.16

30cm

3.86

1.19

3.24

40cm

4.09

0.95

4.31

50cm

4.26

0.82

5.20

60cm

4.33

0.70

6.19

70cm

4.44

0.62

7.16

80cm

4.50

0.55

8.18

Set 4

Length

Voltage

Current

Resistance

10cm

2.58

2.18

1.18

...read more.

Conclusion

Evaluation

Despite this, I do however believe that the results didn’t show a very accurate presentation of resistance over a nickel chrome wire, to improve these results, I think that I could have done any of the following things:

  • Made more repetitions of this experiment
  • Measured the distance over a longer distance, to see if a bigger curve appears in the graph, thus giving bigger correlation

… Could have an effect on the results of the experiment. My graph clearly shows some correlation and a slight curve. This curve shows that the resistance increases because the wire begins to heat up, and increases in resistance so less current can pass through.

Aaron Hudson

...read more.

This student written piece of work is one of many that can be found in our GCSE Electricity and Magnetism section.

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