Electromagnetism

Electricity and magnetism are inextricably linked.  Indeed the electric and magnetic forces were recognised very early on as different appearances of the same force.  In this topic we see how magnetic fields arise from electric currents, and how a current carrying wire produces a force when it interacts with a magnetic field.  This is at the heart of the electric motor.  There are motors of all sizes from little motors in toys to giant machines that propel ships and pump water in pumped storage schemes.

We go on to look at generator effect where a wire moved through a magnetic field generates a magnetic field.  We investigate Faraday's and Lenz's Laws.  We then look at the operation of an alternating current generator.

Then we investigate transformers which enable the bulk transfer of electrical energy around the country in the National Grid.

1. Magnetic Effect of an Electric Current
Tutorial 1 Magnetic Fields Full Page Go
Tutorial 2 Coils in a Magnetic Field Full Page Go
Tutorial 3 Force on Charges in a Magnetic Field Full Page Go
Tutorial 4 Flux, Flux Density, and Flux Linkage Full Page Go
2. The Generator Effect
Tutorial 5 Electromagnetic Induction Full Page Go
Tutorial 6 Simple AC Generators Full Page Go
3. The Transformer Effect
Tutorial 7 Transformers Full Page Go
Tutorial 8 Transmission of Electricity Full Page Go

AS Data Sheet (.pdf file).  Click on the PDF icon.  Download it, print it off, and use it whenever you do a test. 

It will also make very good lavatory reading.  Knowing where a formula can be found will help you no end in the exam.

Topic Test

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