Rotary switch is to rotate the handle to control the main contact point and off a switch. Rotary switches also have two kinds of structure, namely single-unit structure and multi-polar structure. Single pole unit rotary switches in applications is often used together with rotary potentiometers, multi position rotary switch used for working the line switch.
In the context of a transformation of a resistance value, then there is a contact switch, this is old-style television sets and radios switch, fan now is there are several stalls, to pick up the fan windings sets pinout, speed by changing the coil, similar principles and potentiometers.
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