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Qomomoko
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but still don't follow the poles stuff
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Most common form of a switch is a single pole single throw, means you have one contact pole(input) and one optional throw (output). So if the contact is set to the output throw (ON) then the circuit is complete else (OFF) and its an open circuit. By adding throws you give it additional circuit paths that can be completed by the contact pole. Additional poles allow for different inputs and outputs,circuits, to be used in parallel so you have only one mechanism(The switch) that functions for them. The issue is you can't simply attach all the inputs to a single pole and all the outputs to a single throw and hope it works since they may have different voltage, current and circuit limitations.