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What does a potentiometer do?

Potentiometers are once in a while used to straightforwardly control huge force (in excess of a watt), since the force scattered in the potentiometer would be practically identical to the force in the controlled burden.

Potentiometers comprise of a resistive component, a sliding contact (wiper) that moves along the component, connecting with one piece of it, electrical terminals at each finish of the component, an instrument that moves the wiper from one finish to the next, and a lodging containing the component and wiper.

Numerous economical potentiometers are developed with a resistive component (B in cutaway drawing) framed into a curve of a circle normally somewhat less than a full turn and a wiper (C) sliding on this component when pivoted, connecting. The resistive component can be level or calculated. Each finish of the resistive component is associated with a terminal (E, G) looking into it. The wiper is associated with a third terminal (F), normally between the other two. On board potentiometers, the wiper is typically the middle terminal of three. For single-turn potentiometers, this wiper commonly ventures just shy of one unrest around the contact. The lone purpose of entrance for defilement is the restricted space between the shaft and the lodging it turns in.

Another sort is the straight slider potentiometer, which has a wiper which slides along a direct component as opposed to pivoting. Pollution can conceivably enter anyplace along the opening the slider moves in, making powerful fixing more troublesome and bargaining long haul dependability. A bit of leeway of the slider potentiometer is that the slider position gives a visual sign of its setting.

The resistive component of cheap potentiometers is frequently made of graphite. Different materials utilized incorporate obstruction wire, carbon particles in plastic, and an artistic/metal combination called cermet. Conductive track potentiometers utilize conductive polymer resistor glues that contain hard-wearing gums and polymers, solvents, and grease, notwithstanding the carbon that gives the conductive properties.

PCB mount trimmer potentiometers, or “trimpots”, planned for inconsistent change

Electronic image for pre-set potentiometer

Multiturn potentiometers are additionally worked by pivoting a shaft, yet by a few turns instead of not exactly a full turn. Some multiturn potentiometers have a direct resistive component with a sliding contact moved by a lead screw; others have a helical resistive component and a wiper that turns through 10, 20, or more complete upsets, moving along the helix as it pivots. Multiturn potentiometers, both client open and preset, permit better changes; turn through a similar point changes the setting by regularly a 10th as much with respect to a straightforward rotational potentiometer.

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