• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Producing an electromagnet.

Extracts from this document...

Introduction

Duncan Howells

Science Investigation:

Plan

In order to produce an electromagnet you need to have a soft iron core and wire. You need to coil the wire around the iron core and pass a current through the wire to get a magnet.

You can vary the strength of this magnet in a number of ways:

  • Change the number of turns on the coil
  • Alter the size of the current
  • Alter the size of the iron core
  • Change the shape of the iron core
  • Change the material of the core
  • Change the ways in which the coils are wrapped around the core
  • Change the nearby magnetic fields

To find out how the electromagnet is affected when the variables above are changed I will take one of the variables and record how the magnet is affected by it’s change. I will not change any of the other variables to ensure I’m carrying out a fair test.

I have decided to vary the current passed through the electromagnet. I shall do this by using a variable resistor in the circuit and by altering the voltage from the power supply. I will vary the current over a range of 5 Amps (0 – 5A).

...read more.

Middle

88.8

3

290

By doing these preliminary results I determined that I will defiantly be using a wider range of results in the proper experiment (current 0-5A). I also determined that the number of coils I used (30) was suitable for the experiment. I also learned the best way of doing the experiment so I get the most accurate results.

Proper experiment results 1

Note: Iron nail weighs 13.4g

...read more.

Conclusion

I think that the method I used was on the whole a good, efficient and reliable one. I think this because my results were quite accurate. I don’t believe that there was anything I could change to make the method any more accurate.

If I had more time to continue my investigation I could carry out some extra work to further it.

I could do another experiment which uses a similar method to demonstrate the effect on the magnetic field around a wire whilst a current is flowing through it.

A wire is coiled round an iron nail as before and set up in a circuit much similar to the one I used. A current is then passed through the circuit and wire, magnetising the nail. I would then place the nail over a pile of iron filings and the filings should stick to the nail. I would vary the current and the number of coils and see how the amount of filings attracted to the nail varies when the aforementioned factors are changed. This should give me a good idea of how the current and magnetic field around that current are directly proportional.

...read more.

This student written piece of work is one of many that can be found in our AS and A Level Electrical & Thermal Physics section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Electrical & Thermal Physics essays

  1. resistivity if a nichrome wire

    To overcome this problem, the wire could have been stretched out evenly using a plier, to even out the thickness of the wire. Fluctuations in the readings The readings on the voltmeter and the ammeter kept flickering (was not stable).

  2. Free essay

    Resistance of a wire

    To get the most accurate readings from our ammeter and voltmeter we used digital models to get results to the 2nd decimal point. Temperature surroundings have to be taken into consideration as they are almost impossible to maintain perfectly. Sunlight frequently shone through the windows and this could have easily caused slight but important differences in the wire resistivity.

  1. In this experiment I intend to find out what affect the amount of turns ...

    the same meaning that the coils length varies with the number that there are. I have chosen to use the latter method because I think the changing the size of the turns would have a greater negative effect than changing the length of the coil.

  2. Investigate the relationship between electromagnet strength and amount of current flowing through the wire.

    Now, I will explain my method of measurement. The idea behind the experiment is very simple; to add masses of 50g and 100g to an electromagnet at a certain current (in Amps) and record the mass that the electromagnet could hold and then to draw a graph of mass against current and analyse its shape.

  1. Find out what factors affect the strength of an electromagnet.

    Plan: I will plan a fair test to see if my factor (increasing the strength) makes a difference to the strength of the magnet. I will obtain at least three results and find the average between them when plotting the graph.

  2. Test whether changing a certain variable in an electromagnet circuit (either the coils around ...

    * Test that the electromagnet works by turning the power pack on and seeing if it attracts the paperclips. * Change the variable you have chosen e.g. the current (increase and decrease) by turning the central dial on the power pack.

  1. The strength of an electromagnet.

    This is the principal that is used to make an electromagnet. The effect can be further amplified by putting a piece of metal that can be magnetized (iron, nickel, cobalt or steel) in the middle of the coil. Magnets can be formed from certain metals (listed above).

  2. Investigating the factors affecting the size of current flowing through a length of resistivity ...

    This means that the number of electrons which pass a particular point in the curcuit in a certain amount of time is halved. Since current is a measure of the rate of flow of electrons, the current flowing around the circuit will also be halved.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work