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# Investigating the factors which affect the electrical resistance of a wire.

Extracts from this document...

Introduction

Investigating the factors which affect the electrical resistance of a wire

#### Science Theory

##### Resistance is the components of an electrical circuit producing a blockage for electrons.
###### Variables

In my investigation I intend to vary the length of the wire.

I shall measure the resistance using a amp meter and a voltmeter, and then divide the voltage by the current.

#### Prediction

I think that if I lengthen the wire then the resistance will increase.

#### Scientific Knowledge

I think the resistance will change in this way because it takes more energy for an electron to travel down a longer wire because there are more atoms for them to collide with.

Middle

50cm

60cm

70cm

80cm

90cm

100cm

In order to keep my results reliable I shall keep the current the same through out the experiment, I will use the same piece of wire and keep the circuit set up the same.

To ensure safety for myself and others I shall make sure that equipment is used properly and that the wires are not in a position to trip people.

Results

 Length (cm) First Voltage (volts)

Conclusion

This agrees with my original prediction.

###### Evaluation

I took my results using the same apparatus and made sure the wire was the correct length.  I made sure the results were reliable by taking them twice.  I think my results were good enough for me to draw an accurate conclusion from.

The investigation would have been better if the power source was constant, using a battery pack means that the current could decrease through out the investigation as the batteries wear out.  To get better results I would use a bigger range of wire lengths.

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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