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Position sensors give input to the computer about the location of a
moving part by varying the resistance in an electrical circuit.
The computer sends a reference current through a circuit (made by a
contact needle). The contact needle pivots over a resistor wire known
as a "zigzag" wire. When the moving part moves, the needle goes to
the left or the right. This alters the circuit's resistance which
then changes the current returning to the computer. For example: when
the needle moves to the left, the current goes through more of the
resistor. The return flow decreases proportionately.
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