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electromagnet - A coil of wire usually wound on a soft iron or steel core. When current is passed through the coil a magnetic field is generated. The core provides an easy path for the magnetic lines of force. This concentrates the field in the core.
electromagnetic communication - Use of an electromagnetic wave to pass information between two points. Also called wireless communication.
electromagnetic induction - Voltage produced in a coil due to relative motion between the coil and magnetic lines of force.
electromagnetic spectrum - List or diagram showing the range of electromagnetic radiation.
electromagnetic wave - Wave taht consists of both electric and magnetic variation.

Audio
Audio Components Audio components convert sound waves into currents and currents into sounds. Devices that convert sound waves to electrical current are normally know as microphones and devices that


Current
Electric Current Electrons, while they can flow, do not flow through all materials equally and in some materials not at all. When electrons can move through a material it is said to be a conductor an

Coils
Coils As we know from earlier pages, electrons moving through a wire causes an electromagnetic field around the wire. If we wrap the wire in a coil then that intensifies the magnetic field and that m

Relays
RelaysRelays are basically switches that are controlled by electricity rather than mechanical input. Inside the relay, the current used to alter the state of the switch is put into a coil. As we now f

Switches
Switches The are many types of switches but in this section we'll just go into mechanical switches. Switches allow or stop the flow of current or control which path it is to take. The simplest swi