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

An investigation into how the strength of an electromagnet is affected by varying the current

Extracts from this document...


An investigation into how the strength of an electromagnet is affected by varying the current Introduction I am investigating whether, and if so, how an electromagnet is affected by varying the current. An electromagnet is a magnet created by winding a wire around a soft iron c-core and running a current through the wire. Current is measured in Amperes (A). Variables available Voltage Current ·N0 of coils around the c-core Size of the c-cores (thickness/length) Type/size of the wire coiled around the c-core I chose to use current as my variable. I decided this because I have access to accurate equipment to measure the current, when I change it. The other available variables will be kept constant throughout the experiments. Aim I aim to find how varying the current in an electrical circuit affects the strength of an electromagnet. Background Scientific Knowledge My c-cores that I will be using will be ferromagnetic, meaning that it quickly becomes demagnetised when the current is switched off and that it is very good at increasing the strength of the magnetic field produced by the current in the wire. To become magnetic in the first place, the electrons in the c-core (the one with the wires around) ...read more.


I will use the voltmeter so that when the voltage changes, due to resistance, I can correct it on the power pack. I will use 6 different levels of current (1,2,3,4,5 and 6 amps) and I will repeat each experiment once and the take an average to help make a fair test with reliable results. This will give me a good range of results, which can be plotted on a graph, so they will be easy to analyse. Analysis (GRAPHS NOT AVAILABLE). My results are good. They are what I basically expected (strength of electromagnet increased as the current increased. My graphs have shown this, and they each show a good curve of results. I have included a graph of my results, a graph of my found pattern results and a graph to compare these two curves. My results don't fit my prediction. This may have been due to the fact that my prediction wasn't researched thorough. I may have one or two anomalous results. For example, the first result seems to be very low, and there is a big difference between both of my results at 4A. I will be able to discover which are the anomalous results when I come to find a pattern in my results. ...read more.


This means that I would be less likely to make a mistake. Also, I would have liked extra time, so that I could take an average of 3 results, which would make the average more accurate. If I had extended time, I could investigate the experiments further, and get more accurate results. I would like to have done more experiments with a higher current. This would mean that I could investigate the saturation theory, and whether beyond a certain point, it does not matter how much you increase the current, the electromagnet will not get stronger. Also, I could mathematically prove my theory about the current directly affecting the electromagnets strength, due to its increase in power. I could measure the gradients of the graph to find the exact increase in strength between each measurement. It would also be useful and interesting to see whether the heat of the variable resistor affected the results. My anomalous result could have been due to the variable resistor being cold, during the first experiment, when all of the equipment was cold. I would also like some extra time to do some proper research into the findings of the first people to test this investigation. It would also be interesting and useful to discover what they found. Acknowledgements Encarta '98 The Cambridge Encyclopedia Amperes theory web page for engineers ...read more.

The above preview is unformatted text

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. The aim of my investigation is to determine the specific heat capacity of aluminium.

    must be used. To find the specific heat capacity (c) the equation can be rearranged into the form, c= ItV m T Using my trial run results in which, Average I=4.01amps Average V=0.45 volts t=900 seconds Therefore E=ItV=37700J m=1kg T=36OC Therefore c=37700 (1x36)

  2. Investigating how temperature affects the resistance in a wire

    however it must be taken into account that the results are very inaccurate already. Because of this inaccuracy the results may have had a certain random element in them, evidence for this is in the fact that the results are very inaccurate (they have a large range and a large

  1. A2 Viscosity investigation

    these results and error values will probably contain the actual result somewhere in there range bout where is uncertain due to the high amount of inaccuracy although I suspect it to be more close to the actual result as the error values are maximums.

  2. The varying of the resistance of nichrome wire depending on its length

    the red-hot element in an electrical fire and the white-hot element in an electric lamp are both resistors. The total resistance in a series circuit is calculated by adding each individual resistance together. A variable resistor which is also known as a rheostat controls the amount of current which passes through e.g.

  1. Find out whether a longer wire or a shorter wire will have more or ...

    OHMS LAW: The German scientist George Simon Ohm (1787-1854) made an important discovery about resistance. He studied the relationship between the amount of current that flowed through a wire (the amperage) and the amount of electromotive force that drove that current (the voltage). In the substance he tested, he found that if he doubled the voltage, the current would be cut in half.

  2. To find which of the circuits, shown below, are most suitable to measure a ...

    from the ammeter. As shown in the above equation you are multiplying by the current and then diving by that same current to give the answer, and thus this cancels down to give the resistance. Other Values obtained due to calculations: Circuit Two Value specified on Resistor (?)

  1. AimI am trying to find out how the current changes with the area of ...

    After that, I calculate the readings for the area of the solar panel uncovered using a PC program called "Microsoft Excel" to illustrate tables and graphs. ACCURACY AND RANGE OF READINGS To make this experiment as accurate as possible we needed to make sure that the distance length from

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

    The other variable is the current (controlling the amount of electricity which passes through the circuit.) The prediction is that when the current is increased the electromagnet will be stronger and when it is decreased it will be weaker. This hypothesis comes from the same logic as what happens when the amount of coils is altered.

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