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Does The Length Of The Wire Affect The Resistance?

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Introduction

Philip Morris

Does The Length Of The Wire Affect The Resistance?

Plan

In this investigation I will be finding out that if you change the length of the wire will change the resistance.

The lengths of wire I will use will be… 1m, 80cm, 60cm, 40cm and 20cm.

To get the reading that I need I will leave the power pack turned on for 1.30 minutes.  That will give me plenty of time to get my readings.

To make this investigation a fair test I will keep the voltage the same.  The voltage on the power pack will be 2V.  I'm using a power pack so I can keep the voltage constant all the way through the investigation.

I'm going to use a digital voltmeter and a digital ammeter, which will be on a multi-meter.  I will place the voltmeter in parallel with the circuit and the ammeter in series with the circuit.

The wire I will use will be consistine.  I will be making the wire shorter as the investigation moves

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Middle

25cm

0.69

0.13

10cm

0.64

0.22

Test 2

Length of wire

Volts

Amps

1m

0.77

0.04

85cm

0.75

0.05

70cm

0.74

0.06

55cm

0.72

0.07

40cm

0.70

0.10

25cm

0.67

0.13

10cm

0.60

0.24

Test 3

Length of wire

Volts

Amps

1m

0.73

0.04

85cm

0.72

0.05

70cm

0.71

0.06

55cm

0.70

0.07

40cm

0.70

0.09

25cm

0.66

0.13

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Conclusion

The qualities of my results are good because all the repeats on my table are close together.  Also, the quality of my results are shown on my graphs.

The pattern on my graph is easy to see.  There aren’t any anomalies because of my excellent results.  The only problem with my results is that as the investigation went on, thermal energy might have affected the wire by loosing energy or by partially melting.

The reliability was good because of the patterns in numbers.  They came out just as I predicted.

The reliability could have been have been better because of the surface area of the crocodile clips.  I could have connected them to something with a smaller surface area (e.g. a razor blade or a knife).

To make my results more reliable I also could have used a digital multi-meter that goes to more than two decimal places.

I could look at the experiments closer by changing the length of the wire in smaller steps or make the length bigger.  This would give me more accurate results.

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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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