eletromagnetism

magnetic field
1. any ferrous object can be magnetized or demagnetized
2. the space around the magnet is called the magnet field. a compass placed in the magnetic field it would align itself along a line of force going toward the south magnet
electromagnetics
1. an electromagnets is insulated wire wrapped round an iron bar. when a current pasts through the wire a magnet field is created
2. electromagnetics can be use for scrapyard crane, circuit breaker, electric bell and a relay
the motor effect
1. electric motor can be built using a coil of wire that is free to rotate between two opposite magnetic poles. When an electric current flows through the coil, the coil experiences a force and moves
the generator effect and a.c. genertors
1. An electric current is produced when a magnet is moved into a coil of wire in a circuit. The direction of the current is reversed when the magnet is moved out of the coil.
2. a.c. generator Alternating voltage may be generated by rotating a coil in the magnetic field or by rotating a magnetic field
transformer
1. A transformer changes the potential difference of electricity. It only works with alternating current

Zusammenfassung der Ressource

	Erstellt von Edward Dogley vor fast 9 Jahre