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