Potentiometer Sentence Examples
The potential difference of the ends of the low resistance is at the same time measured on the potentiometer, and the quotient of this potential difference by the known value of the low resistance gives the true value of the current passing through the ammeter.
In these circumstances the current passing through the galvanometer is known, provided that the voltage of the battery is determined by means of a potentiometer.
The term potentiometer is usually applied to an instrument for the measurement of steady or continuous potential difference between two points in terms of the potential difference of the terminals of a standard voltaic cell of some kind, such as a Clark or Weston cell.
In principle the modern potentiometer consists of an arrangement by means of which any potential difference not exceeding a certain assigned value can be compared with that of a standard cell having a known electromotive force.
One terminal of the galvanometer can then be shifted to the junction 6 7 g between any pair of consecutive coils and the slider shifted to any point on the potentiometer wire.Advertisement
In some cases the potentiometer wire is wholly replaced by a series of coils divided into small subdivisions.
The potentiometer and the divided resistance constitute a sort of electrical scaleyard by means of which any electromotive force or difference of potential can be compared with the electromotive force of a standard cell.
From the potential terminals of the strip, wires are brought to the potentiometer so as to determine their potential difference in terms of the electromotive force of the standard Clark cell.
In the same manner the potentiometer may be used to calibrate a voltmeter by the aid of a divided resistance of known value.
In electrical measurements connected with incandescent electric lamps the potentiometer is of great use, as it enables us to make accurately and nearly simultaneously two measurements, one of the current through the lamp and the other of the potential difference of the terminals.Advertisement
For this purpose a resistance, say, of one ohm is placed in series with the lamp and a resistance of 100,000 ohms placed across the terminals of the lamp; the latter resistance is divided into two parts, one consisting of loon ohms and the other of 99,000 ohms. The potentiometer enables us to measure therefore the current through the lamp by measuring the drop in volts down a resistance in series with it and the potential difference of the terminals of the lamp by measuring the drop in volts down the tooth part of the high resistance of 100,000 ohms connected across the terminals of the lamp.
A necessary adjunct to the potentiometer is some form of standard cell to be used as a standard of electromotive force.
Another muchused method of measuring con tinuous current voltages or unidirectional potential difference employs the principle of potentiometer.
The principles of telegraphy (land, submarine and wireless) and of telephony are discussed in the articles Telegraph and Telephone, and various electrical instruments are treated in separate articles such as Amperemeter; Electrometer; Galvanometer; Voltmeter; Wheatstone'S Bridge; Potentiometer; Meter, Electric; Electrophorus; Leyden Jar; &C.
Later observers have generally employed a balance method (some modification of the potentiometer or Poggendorf balance) for measuring the E.M.F.Advertisement
The electromotive force so selected is balanced against the steady potential difference produced between a fixed and a sliding contact on a wire traversed by another steady current, and if there is any difference between this last, the potential difference, and the instantaneous potential difference balanced against it, a relay is operated and sets in action a motor which shifts the contact point along the potentiometer wire and so restores the balance.
Additional overrun time can be obtained by adjusting the potentiometer in the control unit.
A cockpit mounted electric potentiometer sets desired power turbine speed.
The basic operation is the capacitor is charged at a speed controlled by the potentiometer.
The gain can be varied from x 0.2 to x 10,000 by means of gain and attenuation switches and a trim potentiometer.Advertisement
The main control potentiometer had 26 studs, with a level change of 2dB per stud over most of its range.
Take the free end of this wire to 470k potentiometer VR1, and wire the potentiometer VR1, and wire the potentiometer to the PCB as shown.
Each input has its own gain control which is a pre-set potentiometer accessible through the front panel.
The throttle potentiometer has definitely been adjusted in the past (probably to try top overcome the problem ).
Three links, two straps and a voltage control potentiometer are provided to achieve this voltage range with different input voltage supplies.Advertisement
It is interfaced to the datalogger via a precision potentiometer.
An essential accompaniment therefore of the potentiometer is a series of standard low resistances, say of o 1, o oi, o ooi ohm, and also a series of higher resistances divided into known fractions.