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autotransformer cours and solved exercise – Electrical Circuits

Note the European substitution of K for a decimal point. The correct symbols for a variable resistor or rheostat are shown at center, although a potentiometer symbol may often be used instead.

Dr principle of operation, and the number of terminals, are identical to the classic-style potentiometer. Solder tabs underneath the slider are hidden in this photo. In this mode, the potentiometer works as a resistive voltage divider. The outer pair connect with the opposite ends of an internal resistive element, such as a strip of conductive plastic, sometimes known as the track.

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A removable plastic finger-grip sold separately, in a variety of styles has been pushed into place. Sujet bac Ste The voltages shown assume that the resistive element has a linear taper and will vary slightly exercicfs on wire resistance and other factors.

It can be used to adjust the power supplied to a circuit, in which case it is properly known as a rheostat, although this term is becoming obsolete.

Other multiple-turn potentiometers may use a screw thread that advances a wiper along a linear or circular track. They are usually mounted directly on circuit boards to allow fine adjustment or trimming during manufacturing and testing to compensate for variations in other components. They are not usually accessible by the end user of the equipment, and their setting may be sealed or fixed when the equipment is assembled.


Figure classic-style potentiometer. In Figurehhevenin base of the shaft shown in black is attached to an arm exercicse in green that moves a wiper orange along a resistive element brown.

Switched Potentiometer In this variant, when the shaft is turned clockwise from an initial position that is fully counterclockwise. A worm gear inside the package, beneath the screw head, engages with an interior gear wheel that rotates the wiper. Since less power is involved, the potentiometer can be small and cheap, and will not generate significant heat. Bac ste normal. A preset variable resistor is shown at the bottom, often referred to as a trimmer or Trimpot. The symbols for a potentiometer are at the top.

The third center terminal connects internally with a contact known as the wiper or rarely, the pickoffwhich touches the strip and can be moved from one end of it to the other by turning a shaft or screw, or by moving a slider.

Sliders are still found on some audio equipment. Newer Post Older Post Home. Slider Potentiometer Trimmer Potentiometer Often referred to as Trimpots, this is actually a proprietary brand name of Bourns.

potentiometer lesson – Electrical Circuits

The latter is com parable with a trimmer where multiple turns of a screwdriver are used to rotate a worm gear that rotates a wiper between opposite ends of a circular track. Exercice Comparateur a un Seuil. A potentiometer can also be used to insert a variable resistance in a circuit, in which case it should really be referred to as a variable resistor, although most people will still call it a potentiometer.

Such multiple-turn potentiometers typically allow 3, 5, or 10 turns to move the wiper from end to end. A full-size, classic-style execrices is shown in Figure This can be used to power-up associated components for example, an audio amplifier. Amplificateur logarithmique et exponentiel.


Trimmers may be singleturn or multi-turn, the latter containing a worm gear that engages with another gear to which the wiper is attached. They may be designed for screwdriver adjustment or may have a small knurled shaft, a thumb wheel, or a knob.

Massive rheostats were once used for purposes such as dimming theatrical lighting, but solid-state components have taken their place in most high-wattage applications. Potentiometers are widely used in lamp dimmers and on cooking stoves see Figure This eercices wastes far less power than if the potentiometer controlled the lighting or heating element directly as a exercifes.

Sliders typically have solder tabs or PC pins. The smaller slider is theoremw for through-hole mounting on a circuit board. The potentiometer adjusts the duty cycle of the power interruptions. This uses a straight resistive strip and a wiper that is moved to and fro linearly by a tab or lug fitted with a plastic knob or finger-grip.

Also known as a slide potentiometer. Trimmers always have linear taper.

Alternatively, a switch inside a potentiometer may be configured so that it is activated by pulling or thevenun the shaft. In Figurethe large one is about 3.

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In Figurethe beige Spectrol trimmer is a single-turn design, whereas the blue trimmer is multi-turn. Figure classic-style potentiometer Schematic symbols for a potentiometer and other associated components are shown in Figurewith American versions on the left and European versions thevenim the right in each case. Exercices Theoreme de Thevenin. It is often used to adjust sensitivity, balance, input, or output, especially in audio equipment and sensors such as motion detectors.