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# osmosis coursework

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Introduction

Resistance in a wire

Aim: to investigate changes in resistance as length of the wire increases.

Prediction: I predict that as the length of the wire increases the resistance also increases

Hypothesis: Resistance is the stopping or obstruction of the flow of electricity. Resistance initiates when there are a lot of particles and it becomes difficult for the electrons to pass through. Resistance is measured in Ohms (   ). Resistance affects the amount of current that passes through. The more the resistance the less the current. The foremost method that we use to determine resistance is ohms law, whereby you can predict the resistance by dividing the voltage by the current, Equation: V/I = R. There are four factors that affect the resistance of a wire. These are:

1. Type of metal used- different metals have different amount of spacing for their atoms.
2. The length of a wire- the longer the length, the higher the resistance.

Middle

I continued doing this until the wire finished (100cm).I kept a constant voltage of 2 throughout the experiment.Record results.I then used Ohms law to calculate the resistance.

Fair test: To facilitate towards having a fair test we had to keep a constant voltage, we had to keep the variables of the temperature, cross-sectional area

Conclusion

Evaluation

I firmly believe that my results are reliable because they compliment my prediction and reflect scientific theories and procedures. Albeit it is almost impossible to get a definitive answer there are no anomalous results. I know this because all my results are on or very close to the line of best fit; my results are also very consistent. There also does not seem to be any errors or miscalculations in my results.

There are some improvements that could be made in order to gain a more accurate result. These are:

• Repeat the experiment five times to get a more accurate average.
• Make a more accurate reading, e.g. to the nearest mm.
• Repeat the experiment using different voltages
• Use a longer ruler, e.g. 2m
• Alter the thickness of the wire
• Use different metals, e.g. copper, aluminum.

By Abdul Wali 10RN

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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