Physics of Electrical Generators

Physics of Electrical Generators

The physics is simple...

First, use the "lines of force" model for a magnetic field. The lines give the direction and intensity of the field. Intensity is just the number of lines per unit area.

Now take a close loop of conductor.. which of course in the real world will contain a load such as an LED lamp etc.

Now *change* the flux of magnetic field through this loop. The flux is just the number of magnetic lines of force that link the loop. The key word here is *change*.

A change will generate a current in the loop. And the size of the current depends on the *rate of change* of the flux. Change the flux faster and you get more current.

How can you change the flux through the loop? Several options..

1) Change the strength of the magnetic field.
2) Change the size of the loop.
3) Increase the number of loops.
4) Change the orientation of the loop.
5) Move the loop in and out of the magnetic field.

That's it. This is the basis of all conventional electrical generators.

The trick is to come up with a design that changes the flux as fast as possible. The faster the change the more current you generate.

Content written and posted by Ken Abbott