Electromagnets: How They Work

Demonstrates that an electromagnetic field is created by the flow of electricity through a conductor, and shows how a simple electromagnet can be constructed. Explains advantages that electromagnets have over permanent magnets. Indicates that there is a relationship between electricity and magnetism., Presents the principles underlying the construction and operation of electromagnets. Demonstrates that the magnetic force of an electromagnet exists only while current is flowing through it; and that this force is proportional to nagnetic permeability of the core, the number of coils, and the amount of current. Applications of electromagnets in cranes, telephones, and motors are illustrated., Demonstrates that an electromagnetic field is created by the flow of electricity through a conductor, and shows how a simple electromagnet can be constructed. Explains advantages that electromagnets have over permanent magnets. Indicates that there is a relationship between electricity and magnetism.NOTE: Two (or more) records have been merged together to create this data.