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

Electromagnets - an investigation on electromagnets, our aim will be to find out what effects the strength of an electromagnet and how it affects it.

Extracts from this document...



Electromagnets are used frequently everyday around the world in many different devices.  An electromagnet is just a piece of iron core wrapped with coiled, insulated wire.  They are activated by the electrical current flowing against them through the coiled wire.  There is a metal armature that is magnetically pulled on to the iron bar when the current flows through the wire that is wrapped around the magnet and switches on whatever component it is linked to and supposed to switch on.

We will be performing an investigation on electromagnets and our aim will be to find out what effects the strength of an electromagnet and how it affects it.

The Backgroundimage00.png

In 1820 Hans Oested discovered that a wire carrying a current produced a magnetic field around its self.  He also found out that if the direction of current changes, then the magnetic field direction will also change now if the wire is coiled together into a solenoid, then the field will get compressed and therefore become much stronger than before.

...read more.


The Method

  1. First I will get the iron core and wrap the insulated wire around it 40 times so that it looks like a solenoid.
  2. Then I will connect the wire ends to the transformer and ammeter.
  3. I will set the current to 1 amp for the start of the experiments and for the last experiment it will be set to 1 amp all the way through.
  4. We then switch on the power and the iron core becomes magnetised.
  5. Then we hold the electromagnet close to the pins that are laid on the table.
  6.  As the pins are attracted and stuck onto the magnet we will count them and record them in a table
  7. I will then increase the current by 0.5 amps until I reach 4 amps, recording the results every time I increase it by the 0.5 amps.
  8. We will then do the experiment No. 2 keeping the current the same (set at 1 amp)  and set the turns to 20
  9. I will attempt to pick up pins, record results and repeat for every time I add an extra 20 turns.
...read more.


The Evaluation

At the end I think that the investigation has worked out quit well and we received the results that we expected.  I predicted that the strength of a electromagnets increase when you either wrap more wire around it or increase the current flowing through it and after performing the investigation I have found that I was right all along.

The results were in fact adequate enough to bring us to a firm conclusion.  But even though my prediction was right we still received results that were not quite expected.  This is due to the errors that were made in recording the results.  We did not record the results properly because there were either pins hanging off or linked together.

We can improve the investigation by performing each experiment five times rather than the three to make it even fairer.  As well as being fair the investigation will gain us very accurate results to show.  We could also improve the investigation by using various types of core and various conducting wire (different diameters).  To detect the actual strength of the electromagnet I could have used a compass.


...read more.

This student written piece of work is one of many that can be found in our GCSE Electricity and Magnetism 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 GCSE Electricity and Magnetism essays

  1. To find out how the positioning of a solenoid (wire that has been coiled) ...

    How the constants will be met: The apparatus will be the same ones throughout all three experiments (nine in total because each experiment will be repeated three times to avoid anomalies as best as possible) by us not changing anything during the actual experiment.

  2. Electromagnets - What factors affect strength of an electromagnet?

    I have then decided to draw a line graph using my results, because a line graph is a simple and the most logical way of showing the chosen two factors that affect the strength an electromagnet. The line graph is also the best way of showing the trends and relationship between two dimensions.

  1. Testing the strength of electromagnets

    So although I found that changing the amps is easier than changing the amount of coils it won't get me a better range of readings. Method The electromagnet is made by coiling the wire around an iron bar and attaching each end to connector wires using crocodile clips which you

  2. Investigate the strength of an electromagnet

    This may be because the iron core is magnetised anyway and was acting as a magnet even before coils were added. This proves that when coils are added the magnet becomes stronger as the line of best fit increased as the number of coils increased.

  1. To find out what happens to the efficiency of a motor as I change ...

    Things that are reliable tend to happen the same way time and time again, so a completely reliable experiment would produce very similar results for any repeats. Although my results contain several severely anomalous results, there not a great cause for concern, as the repeats that are not anomalous definitely have relationship to each other.

  2. The Efficiency of an Electric Motor.

    the motor's resistance +Energy lost as the weight hits the floor M=mass, I=current, F=friction force, R=resistance, V=final speed of weight In my analysis I have chosen to ignore the energy lost in the internal resistance of the motor. This is sensible since the energy lost in the internal resistance was insignificant compared to the energy lost in the load.

  1. Find out how the positioning of a solenoid (wire that has been coiled) on ...

    After all the apparatus is collected a 30 cm long copper wire has to be equally coiled around the iron core (tightly) to form a solenoid (3 times in the middle, 3 times right than left). Then the solenoid will be connected to thepower supply (9V), however with an ammeter

  2. Electromagnetism - investigating what effect increasing the number of turns in a coil on ...

    One end of the solenoid will act as a North Pole, the other a South Pole we can find this when we put a small magnet inside the solenoid, as it will point north. When the soft iron bar is placed inside the solenoid it will make the magnetic field

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