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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.

...read more.

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)

...read more.

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.

...read more.

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