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I am going to design an experiment to measure how the length of the wire affect the resistance in the wire.

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Introduction

 Physics course work.

Planning:

I am going to design an experiment to measure how the length of the wire affect the resistance in the wire. I will use the same wire for all my measurements. It is important to have a fair test, so the cross-sectional area of the wire must be the same for all measurements  because as the cross-sectional area increase the resistance decrease. It is also important to have the wire made of the same material because different materials have different resistance, nichrome is the good conductor of electricity .The temperature also affect the resistance because when it increase the resistance in the wire increase. To get the correct and accurate measurements it is important to keep all the factors that affect the resistance the same and only vary the length.

Predicting:

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Middle

Number and range of my readings:

 I will take 10 readings, the minimum length of the wire is going to be 5 cm and the maximum 50cm. I will start from 50cm and every time the length will decrease by 5cm. To make my results more reliable I will repeat the test starting from the minimum length (5cm), and then find the average. To get more reliable result I should have to repeat the experiment again and find the average of both readings.

Safety:

  Do not short circuit the wires.

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Conclusion

Conclusion:

When I found the current and the potential difference for different lengths I used Ohm's Law R=V/I (resistance=potential difference/ current) to find the resistance. Plotting points on a graph resistance vs length and drawing a line of best fit, showed me how resistance and length

Increase proportionally to each other. The electric current in the wire is the flow of electrons. When the wire gets longer electrons will have to travel longer distance and loose more energy therefore resistance is proportional to the length of the wire. This supports my prediction.

Evaluating:

   All the points were near the line and there was no strange points compare to the others so I think that my readings were accurate.

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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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