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Electromagnetism Investigation

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Introduction

G.C.S.E SCIENCE COURSEWORK BY JENNA DAWSON Electromagnets We will be measuring the distance of a compass attracted to the electromagnet. We will change the amount of turns on the coil. Research An electromagnet is a coil of wire. An electric current within the coil creates a magnetic field. The field can be made stronger by winding the wire round a piece of iron, increasing the amount of turns on the coil or increasing the size of the current flowing through the coil. Electromagnets are far more useful than permanent magnets because: they can be switched on and off, the strength of the magnetic field can be changed by altering the current and they can easily be made into a variety of shapes and are less expensive to make. Variables Independent Variables * Strength of electromagnet (changing the amount of turns on the coil) * Size of compass * Coating on wire (PVC) ...read more.

Middle

The independent variables are controlled by the school due to the resources they have. The only independent variable we can change is the strength of the electromagnet, by changing the amount of turns on the coil. All the others will stay the same. Fair test We will make it a fair test by using the same equipment throughout the experiment, keeping the voltage the same and repeating the experiment three times to get an average. Safety * No liquid substances near the experiment. * Make sure all wires and equipment are intact. * Make sure everything is set up correctly before turning on the power * Do not, use the main electricity supply, use a power pack. Method 1. Collect apparatus (Compass, metre ruler, two crocodile clips, iron nail, wire, power pack, ammeter, three leads.) 2. Set up apparatus (follow diagram). 3. Start with ten turns on the coil and turn the power on. ...read more.

Conclusion

Evaluation Our results are as accurate as we could make them, they were measured to the nearest millimetre. There is not much difference between all the results apart from the last four in the third repeat. The anomalous results are like this because we did not finish the experiment in one lesson and had to use different equipment next time. We could improve the experiment to get better and more precise results by using the same equipment for the whole experiment, use a bigger compass so it is easier to see a movement of 5? giving a more precise reading of the distance of the compass to the electromagnet, using a longer nail so we could fit more turns of the coil so we could take more results to produce a better average and using a measuring device with finer points of measurements then mm. The evidence we gathered is sufficient enough to support a firm conclusion. There are two further experiments we could carry out to get additional information they are changing the diameter of the coil and overlapping the turns on the coil. ...read more.

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