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# How does the length of wire affect its resistance...?

Extracts from this document...

Introduction

How does the length of wire affect its resistance...?

Aim:

Conduct an experiment to investigate how changing the length of a length of wire affects its resistance

Section 1…  Planning(8 marks)

Method…

I will build the following circuit

Theory…

There are four things that affect the resistance of a piece of wire

• Length
• Area
• Temperature
• Material

In this experiment I will change the length, whilst keeping the other factors (area, temperature and material) constant

I will also keep the wire straight to make the length measurement more accurate

Prediction…

An electric current is a flow of electrons along a length of wire.

The electrons have a negative charge, these move past ions which have a positive charge.

There is an attractive force between the

Middle

Area

• I will make sure that I measure the wire carefully
• Also during setting up the experiment I will ensure that I don not stretch the wire which will make it thinner and increase the resistance

Method

1. Get the following equipment
• Voltmeter
• Ammeter
• Crocidile clips
• Nichrome wire
1. Build the circuit
2. Connect a 10cm length of Nichrome wire.
3. Measure Voltage and Current
4. Calculate resistance using the following formula, Resistance = Voltage / Current
5. Repeat the experiment for the following lengths

Conclusion

Looking at my results….

Length        20cm                Resistance        ……Ω

40cm                Resistance        ……Ω        and…..

Length        30cm                Resistance        ……Ω

60cm                Resistance        ……Ω

When the length is doubled so does the resistance.

The resistance is directly proportional to the length

Evaluation

I think my results were accurate because…

• I used straight wire to ensure accurate measuring
• I kept the voltage (and current) low so the wire would not heat up and increase the resistance
• The results agreed with my prediction

If I did the experiment again…

• I would use new connector wires that have no corrosion on them that may increase resistance
• Use a different voltmeter and ammeter to check my results
• Use a longer length of wire to test the length / resistance relationship
• Use a new piece of wire to ensure that it was all the same cross-sectional area

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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