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# In this experiment the resistance change in a wire will be investigated. I will be investigating if the thickness or cross-sectional diameter of the wire affects the resistance.

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Introduction

Tim Hall        Mr Bolt                11wt

Resistance coursework

## Aim

In this experiment the resistance change in a wire will be investigated. I will be investigating if the thickness or cross-sectional diameter of the wire affects the resistance.

## Variables

The input variable will be the thickness of the wire to the nearest millimetre.

The output variable will be the readings on the ammeter and voltmeters.

The controlled variables will be the length of wire and the current being passed through the wire.

The length of wire will stay the same and will already be measured to 50cm for us. The current will be kept on the same level using the same power pack.

Apparatus

• Power pack
• Banjo board
• Ammeter and Voltmeter
• Wires
• Bulb
• Wires to connect the apparatus
• Ruler
• Crocodile

## Safety

This is a very safe experiment as it does not involve any chemicals however we must make sure the voltage does not go higher than 12V.

## Method

• Set up the apparatus as shown above.
• Measure a piece of wire to 50cm
• Clip on the crocodile clips at each end
• Turn the power pack to 12V
• Now write down the readings from the voltmeter and the ammeter
• Repeat with different thickness’ of wire
• Repeat the whole experiment 5 times so an average can be taken
• Work out the resistance (R=V/I)

Middle

The results from the trial experiment were fine so I don’t need to change anything for the final experiment.

## Results

Exp. 1

 Thickness of wire (mm) Ammeter reading (A) Voltmeter reading (V) 0.71 0.18 0.13 0.56 0.18 0.20 0.45 0.18 0.29 0.31 0.18 0.66 0.28 0.18 0.70

Repeat 1

 Thickness of wire (mm) Ammeter reading (A) Voltmeter reading (V) 0.71 0.18 0.12 0.56 0.18 0.19 0.45 0.18 0.28 0.31 0.18 0.60 0.28 0.18 0.71

Repeat 2

 Thickness of wire (mm) Ammeter reading (A) Voltmeter reading (V) 0.71 0.17 0.12 0.56 0.17 0.20 0.45 0.17 0.29 0.31 0.17 0.59 0.28 0.17 0.70

Conclusion

#### Comparison with Prediction

I said in my prediction that “I think that when I increase the thickness of the wire, the resistance will be lower.”

When comparing this to my conclusion I can safely say that my hypothesis was correct as I achieved a good set of results.

## Quality of my Results

I thought I had quite good results from my experiment as I didn’t get any anomalies, even when I did 5 repeats, so I must have put in a good effort in the experiment.

My experiment went well with no problems because I made it a fair test and didn’t mess around.

## Improving my Experiment

I could do more repeats.

I could use more thicknesses of wire.

I could use a different voltage going in to the circuit.

I could calculate the resistance using ohms law.

## Further Investigations

I could try doing the same experiment but keeping the thickness of the wire the same, and changing the length instead

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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