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Find out how the length of wire will affect the resistance in a circuit.

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Introduction

Steven Gatesman

Investigating Resistance

Plan:

The aim of my experiment is to find out how the length of wire will affect the resistance in a circuit. The only item I will change is the length of the wire. Other items such as power pack, the ammeter, the voltage meter and other wires in the circuit will stay the same to ensure that the experiment is a ‘fair test’. Using the ammeter reading and the voltage meter reading I can calculate the resistance of the wire by means of Ohms Law.

Ohms Law:

V=I/R,   R=I/V,   I=VxR

V = voltage

 I = current

R = resistance

Using this triangle I can produce the following formula:

R = V / I

Resistance = voltage / current

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Middle

Prediction:

I predict that the longer the wire, the more resistance there will be. I believe this because if the wire is longer then there is more material for the electrons to get through thereby increasing the resistance.

Apparatus:

I will use the following equipment in my experiment:

Circuit Diagram:

This is a circuit diagram of my experiment; at the top of the circuit is the symbol for the battery which in my experiment is the power pack. The A represents the ammeter and the V represents the voltage meter.

Conclusion / Evaluation:

From the graph I can see one very clear trend, which is, as the length of the wire increases so does the resistance of it. Another, more significant thing is that it the increase is constant.

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Conclusion

Instead of connecting the voltmeter to the main circuit I would connect it to the wire which is being tested. I would do this so that the voltmeter is measuring the voltage of just the wire being tested and not the wires of the main circuit as well.


The next modification I would make would be to use pointers instead of crocodile clips. I would do this because pointers would be more accurate. The pointers would be more accurate because the tips have a much smaller area than the crocodile clips giving a more accurate measurement of the length of wire.


As well as making these modifications I would also improve my Investigation by testing the same wire but different widths of that wire. I would do this to expand on my Investigation.

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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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