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magnetic poles - Points of a magnet from which magnetic lines of force leave (north pole) and arrive (south pole).
north pole - Pole of a magnet out of which magnetic lines of force are assumed to originate.
pole - In an active filter, a single RC circuit. A one pole filter has one capacitor and one resistor. A two pole filter has two RC circuits and so on.
single pole double throw - (SPDT) Three terminal switch in which one terminal can be connected to either one of the other terminals.
single pole single throw - (SPST) Two terminal switch or relay thet can open or close one circuit.

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

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