Electricity & Magnetism

by

Earnest Garrison


The concepts of electricity and magnetism are usually taught separately. But I tend to think of them as being present at the same time ( not entirely correct but a lot of times true. The connection between electricity and magnetism becomes evident through the use of electromagnets. Here a coil of wire that has a current passing through it and a metal core is induced to produce a magnetic field. The field strength is directly proportional to the number of loops in the coil and the current in that passes through it. The section entitled more electromagnets contains a video about electromagnets.  

 

                                                        

 

Questions

                  1) What are the differences between permanent magnets and electromagnets ?

                  2) How is electricity flowing through a coil of wire used to make an electromagnetic ?

                  3) What is the differences between an electromagnetic that has DC current versus AC current ? 

This a picture of Eanest

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