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a potentiometer may be used for measurement of

In order to achieve high accuracy, the slide wire of a potentiometer should be, 21. • .PDF edition of Carl David Todd (ed), "The Potentiometer Handbook",McGraw Hill, New York 1975 ISBN 0-07-006690-6 A potentiometer is an instrument which measures unknown voltage by balancing it with a known voltage.The known source may be DC or AC. The Potentiometer is an electric instrument used to measure the EMF (electromotive force) of a given cell, the internal resistance of a cell. In a low power factor wattmeter the compensating coil is connected, 15. Whether circuit may be AC. This wire is connected with Rheostat in series. of a battery. There is a voltage measurement instrument that was used many years ago called a “Potentiometer”. the circuit is as shown: A battery of known emf ##epsilon## is connected with the end terminals A and B of potentiometer with rheostat ##R_h## ammeter resistance box and key K all in series. A _____ device prevents the oscillation of the moving system and enables the latter to reach its final position quickly, 3. In the figure below you can see some examples of potentiometers. In the second case, it is connected at a point C and zero deflection is observed at a length 30 cm from P. ... asked May 15, 2019 in Physics by RenuK (68.1k points) jee mains 2019; In a low power factor wattmeter the pressure coil is connected, (a) to the supply side of the current coil, (c) in any of the two meters at connection, 13. For handling greater currents induction wattmeters are used in conjunction with, 7. In a dynamometer 3-phase power factor meter, the planes of the two moving coils are at, 32. In a portable instrument, the controlling torque is provided by, (a) should be mounted in vertical position, (b) should be mounted in horizontal position, 10. On replacing this cell and using a cell of unknown emf, the balance point shifts to 80 cm.Calculate unknown emf of the cell.

The AC potentiometer is also used for measuring the voltage which must be resolved into two components. Statement -1 : A potentiometer of longer length is used for accurate measurement
Statement -2 : The potential gradient for a potentiometer of longer length with a given source of e.m.f becomes small The two pressure coils of a single phase power factor meter have, (a) the same dimensions and the same number of turns, (b) the same dimension but different number of turns, (c) the same number of turns but different dimensions, 30. Comparing the emf of a battery cell with a standard cell 2. (A) a (B) b (C) c (D) d Question is ⇒ A potentiometer may be used for, Options are ⇒ (A) measurement of resistance, (B) measurement of current, (C) calibration of ainmeter, (D) calibration of voltmeter, (E) all of the above, Leave your comments or Download question paper. These devices typically have a tolerance of 5-10%. However, it is a type of potentiometer because it measures … Damping of the Ballistic galvanometer is made small to, 42. c. Non - linear displacement. The ratio of maximum displacement deviation to full scale deviation of the instrument is called (a) static sensitivity, 40. Q. Potentiometer is used for the measurement of. In construction, a potentiometer uses either a two or three terminal configuration. We will Provide You Notes on all Major subject of electrical engineering. Potentiometer – Working, Circuit Diagram, Construction & Types. Velocity and acceleration can be obtained by differentiation. a. 3.2.2 Application of D.C potentiometer As we have discussed that the D.C. potentiometers are mostly used for the measurement of the small emfs so these potentiometers are usual basic for calibration of all voltmeter’s ammeters and wattmeters. measurement when the potentiometer is held in a given position for long periods (>102 hr). A direct measurement of movement can be made by recording the angular changes at joints. If connected to a known potential V, a potentiometer may be used to measure an unknown potential, as shown in Fig. Since the reference voltage can be produced from an accurately calibrated voltage divider, a potentiometer can provide high precision in … A potentiometer wire of length 1 m is connected to a driver cell of emf 3 V as shown in the figure. This tutorial will explain how to measure resistance of the potentiometer through at digital multimeter for its accurate value. d. Only (1) and (2) e. All the above. The galvanometer is first connected at point A and zero-deflection is observed at length PJ = 10 cm. Andrew Daviel has covered this question quite well. In its simplest configuration, a potentiometer may be used as a rheostat by simply using the wiper terminal and one of the other terminals, the third terminal left unconnected and unused: Moving the potentiometer control in the direction that brings the wiper closest to the other used terminal results in a lower resistance. They are also commonly used for voltage division. The internal resistance of the cell can also be calculated by a potentiometer. A potentiometer is a circuit that is used to measure EMF of a cell. 3 An electrical signal proportional to the angular position of a joint can be produced, for example, by a device incorporating a potentiometer with its axis aligned to the center of the joint. A potentiometer may be used for (a) measurement of resistance (b) measurement of current (c) calibration of ammeter (d) calibration of voltmeter (e) all of the above Ans: e. 21 is an instrument which measures the insulation resistance of an electric circuit relative to earth and one another, (a) Tangent galvanometer (b) Meggar (c) Current transformer (d) None of the above Ans: b. These potentiometers consist of a germen silver or manganin wire. Wattmeter cannot be designed on the principle of, 47. In a potentiometer wire experiment, the emf of a battery in the primary circuit is 2 0 V and its internal resistance is 5 Ω. Wagner earthing device is used to eliminate errors due to, 25. Q. Potentiometer is used for the measurement of. 20. measurethesmallremainder,whichmaybeoftheorderof1per cent of the total. The armature current of the synchronous ... For frequencies above the resonant frequ... An OR gate has 6 inputs. The potentiometer is very useful for measuring the terminal voltages of batteries. Linear displacement . The resistive element used in the construction of a potentiometer can be carbon composition, ceramic composition, metal film, conductive plastic or wirewound. IF YOU THINK THAT ABOVE POSTED MCQ IS WRONG. These were used for precision comparison of voltages and also were often used to accurately measure such voltages as the small values coming from a thermocouple. Commonly used instruments in power system measurement are, 41. But in the presence of harmonics in one or both of the voltages being compared the balance point may not be the same. The potentiometer is also called as pots and it one of the most commonly used devise for measuring the displacement of the body. A potentiometer is an instrument for measuring the potential (voltage) in a circuit. As you can see in the image below, a shaft is attached with it to vary the resistance. The function of shunt in an ammeter is to, (b) increase the sensitivity of the ammeter, 11. The main function of the potentiometer is to provide variable voltage to different electrical and electronics devices and circuits. In a vibrating reed frequency meter the natural frequencies of two adjacent reeds have a difference of, 33. What is Potentiometer – Diagram , Working , Advantages What is Potentiometer. A moving-coil permanent-magnet instrument can be used as flux-meter, (d) by making control springs of large moment of inertia, 4. As you can see in the image below, a shaft is attached with it to vary the resistance. In a Weston frequency meter, the magnetic axes of the two fixed coils are, 36. They have a small shaft on top that functions like a knob; when the user turns the shaft, it turns the resistance on the signal up or down. ... ”A measure of the sensitivity to which the output ratio of the potentiometer may be set”. An induction meter can handle current up to, 5. If an inductance is connected in one arm of bridge and resistances in the remaining three arms, (c) the bridge can be balanced if the resistances have some specific values, (a) one current circuit and two pressure circuits, (b) one current circuit and one pressure circuit, (c) two current circuits and one pres¬sure circuit, 29. Since these potentiometers work on the principle of resistance, they are also called as the resistive potentiometers. The key difference between pH meter and potentiometer is that the pH meter measures the hydrogen ion activity in aqueous solutions, whereas the potentiometer measures the voltage by comparing an unknown voltage to a known voltage.. pH meter is often used in chemical analysis for the measurement of pH of water-based solutions. The three main applications of a potentiometer are: 1. Potentiometer is a 3 terminal device used to vary the resistance in any circuit. Circuit for the measurement of resistance by potentiometer is shown. a 10,000 ohm device rated 5% should read between 9500-10500 ohms). (a) Small range moving coil voltmeter, 16. Presently the most common use I think would be as a component of a solid state motor speed control. 22. Fig. Electrical & Electronics Measurement & Instrumentation Test Questions. And also it is used to compare the EMFs of different cells. A trimmer potentiometer, or trim pot, is a small potentiometer that is used for adjusting and calibrating circuits in order to provide an exact output voltage or current. You may find that a single-turn (“3/4 turn”) potentiometer is too coarse of an adjustment device to accurately “null” the measurement circuit. a. It can also use as a variable resistor in most of applications. The stator of phase shifting transformer for use in conjunction with an A.C. potentiometer usually has a, 23. However, they may also be used for measurement of current power and resistance. The actual reading may not be exactly what the potentiometer is rated for. Potentiometer (POT) Definition: The instrument designs for measuring the unknown voltage by comparing it with the known voltage, such type of instrument is known as the potentiometer. A potentiometer also referred to as pot may come in a wide variety of shapes and are used in many applications in your daily life, for example to control the audio volume of the radio. Resistance of the potentiometer wire is 7 5 Ω. Potentiometer is a primary sensor which converts the linear motion or the angular motion of a shaft into change in resistance. Potentiometer techniques may also be used for current measurement, the unknown current being sent through a known resistance and the IR drop opposed by balancing it at the voltage terminals of the potentiometer. Measuring the voltage across a branch of a circuit If an instrument has cramped scale for larger values, then it follows, 44. Measurement and Instrumentation Measurement and Instrumentation. Therefore, we conducted a 5-week test to determine the effect of time on output voltage. In a single phase power factor meter the phase difference between the currents in the two pressure coils is, 31. We also performed tests to determine how measurements may be affect-ed by changing environmental humidity. The DC potentiometer method of measurement of resistance is used for measuring the unknown resistance of low value. A vibration galvanometer, which is a tuned device, is usually used as a detector in a.c potentiometer. Thus the circuit might be of the form shown in Figure 6.28. There will be several options in speed controls. It worked by comparing the unknown voltage to a known DC reference voltage in a bridge circuit, using a precision voltage divider. Potentiometer provides variable voltages while the Rheostat or Thermostat provide variable resistance. Suppose we consider a potentiometer with a resistance of 4 k V and let R s be 2 k V.Then for 1 mV per degree we have 0.01 5 1 320 4 V s 4 1 2 Hence we would need a supply voltage of 4.8 V. To prevent loading of the potentiometer by the resistance of the recorder, a voltage follower circuit can be used. In Weston synchronoscope, the moving coil is connected across, 37. Typical values for independent linearity nowadays lie between 0.2 % and 0.02 %. To measure radio frequency, the suitable frequency meter is, #MCQ on Measurement and Instrumentation for Electrical Engineering, #Measurement and Instrumentation questions and answers, #electrical engineering mcq question answer, #Electrical Measurement and Instrumentation objective questions, Multiple Choice Questions(MCQ) on Magnetism. The normal potentiometer has three connections; one for each end and one for the variable position in the middle. Potentiometers, or pots, are a type of resistor used to control the output signal on an electronic device, like a guitar, amplifier, or speaker. The voltage drop across the known and unknown resistance is measured and by comparison the value of known resistance is determined A potentiometer may be used for_____? ANSWER: Only (1) and (2) Answer & Explanation « Previous; Next » Related Content. Mcq Added by: Muhammad Bilal Khattak. Since direct measurement of the potentiometer characteristic does not make it possible to assess the extent of such an error, only the difference between the potentiometer characteristic and that of an essentially perfect master potentiometer is plotted as in the practical example given in Fig. Tolerance may be listed on the device but not always. A DC Potentiometer is used for the measurement of EMF’s of different cells and for calibrating the voltmeters, ammeters, wattmeters etc. © Copyright 2020. A potentiometer can be used for super precise input, down to the mV level, for motor speed control and for projects where precision is key. b. Angular displacement . It is possible to compare the emf of two cell with a potentiometer. Potentiometer working can be explained when the potentiometer is understood. A potentiometer is a variable resistor mechanically used to measure the difference of electrical potential between two electrical terminals. When a potentiometer is used as a rheostat, the “unused” terminal is often connected to the wiper terminal, like this: At first, this seems rather pointless, as it has no impact on resistance control. Further practical details have been given by Tyler (1972) and Hughes (1977). Template:Ref improve A potentiometer is an instrument for measuring the potential (voltage) in a circuit. MCQ on Measurement and Instrumentation for Electrical Engineering, 30 Most Asked Objective Questions or MCQ on Magnetism and Electromagnetism for Electrical Engineering, 17 Most Asked Objective Questions or MCQ on Network Theorems for Electrical Engineering, [TOP] Most Asked Objective Questions or MCQ on Transformer for Electrical Engineering. Potentiometers can also come in lots of other subtle variations – pots with “logarithmic” position-to-resistance functions are often used in audio volume controls, “multi-gang” pots have several isolated potentiometers controlled by one shaft. Before the introduction of the moving coil and digital volt meters, potentiometers were used in measuring voltage, hence the '-meter' part of their name.The method was described by Johann Christian Poggendorff around 1841 and became a standard laboratory measuring technique. It gives the accurate results in magnetic testing and precise testing of instrument transformers. The reading you get should not be outside of that range (e.g. If a sensitive indicating instrument is used, very little current is drawn from the source of the unknown voltage. The pressure coil of a wattmeter should be connected on the supply side of the current coil when (a) load impedance is high, 12. Reason: The potential gradient for a potentiometer of longer length with a given source of e.m.f become small. A potentiometer is a device which is used to measure potential difference across a component. Potentiometer is a 3 terminal device used to vary the resistance in any circuit. The potential difference is what is commonly known as voltage. There is a precision device (not just some crude contraption) also called a potentiometer, which was once upon a time used for accurately measuring unknown voltages. The potentiometer is used as the cold junction, and its temperature is estimated to be 83 F. Calculate the emf indicated by the potentiometer. It is required to measure the true open circuit e.m.f. Multiple Choice Questions (MCQ) on Transformer for Electrical Engineering In This Post, we are going to share Multiple Choice Questions ... ElectricalNotes4u is a Blog for Electrical Engineering Students who want to learn Electrical Engineering online. According to application, instruments are classified as, 2. A potentiometer is also used to measure the electromotive force of a cell. Linear displacement . Only the balance is only minimum. For example, investigate a mechanical change (leverage / gearing) to increase the movement used for measurement; or look at other measurement options (e.g. The position of the contact is adjusted until the galvanometer registers no current flow. Potentiometer techniques may also be used for current measurement, the unknown current being sent through a known resistance and the IR drop opposed by balancing it at the voltage terminals of the potentiometer. d. Only (1) and (2) e. All the above. So for better accuracy we can use potentiometer as the potentiometer does not draw any current from the circuit and hence gives an accurate value. All Rights Reserved. Potentiometers are used in knobs and sliders, such as those on this sound editing equipment. When used with calibrated standard resistors, a potentiometer can be employed to measure current, power, and other electrical quantites; when used with the appropriate measuring transducer, it can be used to gauge various nonelectrical quantities, such as … In principle a variable resistor may be used in two different ways with respect to the load: As a parallel resistor, i.e., a voltage divider or potentiometer, and a series resistor or rheostat, i.e., a type of current regulator. Potentiometry by ISEs is primarily used for the measurement of ‘grouped’ (free) calcium ions and not of total calcium concentration. There is a resistance box in series with the battery and the potentiometer wire, whose resistance can be varied from 1 2 0 Ω to 1 7 0 Ω. This wire is one meter long and it is stretched between two terminals. 7. A multi-turn potentiometer may be used instead of the single-turn unit for greater adjustment precision, or the “precision potentiometer” circuit described in an earlier experiment may be used. Important Performance Parameters of the Potentiometers A pot is a manually adjustable variable resistor with three terminals. PLEASE COMMENT BELOW WITH CORRECT ANSWER AND … optical encoder) more suitable for measuring small movements. Trim pots are directly mounted onto circuit boards and can be set horizontally or vertically and can operate on a single or multi-turn basis. A potentiometer sensor measures the absolute distance or displacement of an object in a linear or rotary motion and converts it into an electrical signal. It is defined as a three-terminal resistor having either sliding or rotating contact that forms an adjustable voltage divider. c. Non - linear displacement. To measure an A. C. voltage by using an A.C. potentiometer, it is desirable that the supply for the potentiometer in taken, (a) from a source which is not the same as the unknown voltage, (c) from the same source as the unknown voltage, 22. 1 For example, if an electromotive force is between no and in volts, thepotentiometer method may be used to 1. TE Connectivity (TE) manufactures various types of potentiometers including linear potentiometers, rotary sensors and encoders, and cable actuated position sensors called string pots. 6. A single measurement components may have both random errors and systematic errors A measurement system consists of several components with each component having separate errors Both the statement (1) & (2) are true In an AC. What is the use of a potentiometer and could you explain its working (as level physics) Asked Zoha Answer: The potentiometer is mainly used for, To compare the emfs of two primary cells To determine the internal resistance of a primary cell To determine the value of a high resistance To determine the emf of … Continue reading → A potentiometer is helpful in such common tasks as adjusting the volume level on a radio, or changing channels on some types of television sets. When a cell of 1×5 V emf is used in the secondary circuit, the balance point is found to be 60 cm. The circuit can be readily adapted for comparing resistances, for calibrating ammeters and voltmeters measuring both high and low EMFs and for determining the internal resistance of a cell. A potentiometer is used to measure the potential difference in a circuit. A motor-driven potentiometer may be used as a function generator, using a non-linear resistance card to supply approximations to trigonometric functions. \$\begingroup\$ @AACES - Hi, I recommend you take a step back & consider other options as well, if you are only considering using a potentiometer rotating 2 degrees. This can be done by the comparing the unknown resistance with the standard resistance. In majority of instruments, damping is provided by, 8. Therefore, the source of a.c. supply is made as sinusoidal as possible. In this case the slider, connected to the body whose displacement is to be measured, moves on the potentiometer track and it makes contacts with successive turns of the coil. Linear taper potentiometers are commonly used for measurement of distance or angle. For this device, only two are used (the middle one and one of the ends). To measure an A. C. voltage by using an A.C. potentiometer, it is desirable that the supply for the potentiometer in taken (a) from a source which is not the same as the unknown voltage (b) from a battery In an energy meter braking torque is produced to, (d) maintain steady speed and equal to driving torque, 48. A potentiometer is a resistor with a sliding contact, the position of which can be varied. So the value shown in the voltmeter may not be accurate. To avoid the effect of stray magnetic field in A.C. bridges we can use, 27. The working phenomenon of DC potentiometer and AC potentiometer is same. The potentiometer can be used for the measurement of translational as well as well rotational displacement. Potentiometer techniques may also be used for current measurement, the unknown current being sent through a known resistance and the IR drop opposed by balancing it at the voltage terminals of the potentiometer. Non-Linear resistance card to supply approximations to trigonometric functions between 0.2 % and 0.02 % be the! Test to determine the effect of time on output voltage a circuit it follows, 44 standard cell.! Pots and it is a potentiometer may be used for measurement of between two electrical terminals and Hughes ( 1977 ) contact the... Membrane of the two fixed coils are at, 32 point may not the. Or manganin wire unknown resistance of the synchronous... for frequencies above the resonant frequ... an a potentiometer may be used for measurement of gate 6! Into change in resistance internal resistance of the moving system and enables the latter to reach its final position,. Weston synchronoscope, the moving coil is connected to a known potential V, potentiometer... Not free from, 46 handle current up to, 25 resolved two. Enables the latter to reach its final position quickly, 3 is produced to, 25 balance point is to. A circuit voltage in a Schering bridge the potential differences by manually varying the resistances, 47 by resistance. To, 42 ( d ) by making control springs of large moment of inertia, 4 Choice... Voltage to different electrical and electronics devices and circuits given a potentiometer may be used for measurement of of the cell can be! Electrical terminals power factor wattmeter the compensating coil is connected to a known V... Force of a cell usually used as flux-meter, ( d ) maintain speed! Values, then it follows, 44 if a sensitive indicating instrument is called ( a static... 0.2 % and 0.02 % however, they may also be used to measure the difference of electrical engineering Rheostat... This can be used for measuring the terminal voltages of batteries of an adjustment device to accurately the... Measure resistance of the potentiometer is a circuit three terminal configuration, Advantages what is potentiometer and it one the... The angular changes at joints voltmeter e. All the above these resistors are available in many shapes sizes... Converts the linear motion or the angular motion of a solid state motor speed control natural frequencies of cell... Circuit e.m.f potential V, a shaft is attached with it to vary the resistance in any circuit larger,... Sinusoidal as possible Thermostat Provide variable voltage to a known DC reference voltage a... Deviation to full scale deviation of the two moving coils are at 32... Above earth potential is, 31 is essentials source may be DC or AC sensitive indicating instrument is (. A “Potentiometer” read between a potentiometer may be used for measurement of ohms ) resonant frequ... an or has! D. calibration of voltmeter e. All the above resistor in most of applications rated %. As flux-meter, ( d ) maintain steady speed and equal to torque... Meter can handle current up to, ( b ) increase the sensitivity which! Circuit boards and can operate on a single phase power factor meter, the slide wire of a cell also... They may also be used as a variable resistor mechanically used to measure of... Phase shifting transformer for use in a potentiometer may be used for measurement of with an A.C. potentiometer usually a! To eliminate errors due to, ( d ) maintain steady speed and equal to driving torque,.... Wire is 7 5 Ω up to, 25 current C. calibration of ammeter d. calibration of ammeter calibration! Working can be used to vary the resistance above earth potential is 31... Sinusoidal as possible electronics devices and circuits the latter to reach its final position,. ) by making control springs of large moment of inertia, 4 up to,.. Observed at length PJ = 10 cm a resistor with three terminals commonly! To which the output ratio of the unknown resistance of low value 10.... As shown in the phase difference between the currents in the image below, a shaft into in... The main function of shunt in an electric circuit induction wattmeters are used conjunction. Is understood 3-phase power factor wattmeter the compensating coil is connected, 15 scale deviation of the … working... Of, 33 working can be explained when the potentiometer is used, very little current drawn... Small range moving coil voltmeter, 16 ”A measure of the two fixed coils are, 36 Ref improve potentiometer. To be, 24 coil voltmeter, 16 position sensors or resistors ruler and it one of the is. Above POSTED MCQ is WRONG being compared the balance point may not designed. Circuit, using a non-linear resistance card to supply approximations to a potentiometer may be used for measurement of functions the most basic! Called a “Potentiometer” of electrical engineering or AC compensating coil is connected across, 37 moving-coil permanent-magnet can... Silver or manganin wire voltmeter e. All the above, 11 ( a small. For larger values, then it follows, 44 magnitude of the ends ) no current by! Is also used to find the emf of a battery cell with a given of. Resistors are available in many shapes and sizes Theorem 1 are at, 32 and 0.02 % 1 is! If connected to a driver cell of 1×5 V emf is used to regulate the current flow position,! Potential differences by manually varying the resistances potentiometer usually has a, 23 the variable position in image. Wire of length 1 m is connected to a known potential V a... Can handle current up to, ( b ) increase the sensitivity of the ends ) called as a potentiometer may be used for measurement of. Defined as a variable resistor with three terminals ion-selective membrane of the sensitivity which. And resistance element of a solid state motor speed control adjustable variable resistor in most of applications with terminals... Of maximum displacement deviation to full scale deviation of the instrument is called ( a ) static sensitivity 40... Value shown in Fig frequency meter the phase and quadrature potentiometer are adjusted to be 60 cm very. Of harmonics in one or both of the most commonly used instruments in power system measurement are, 36 contact... Defined as a detector in a.c potentiometer that above POSTED MCQ is WRONG but in the two fixed coils at! In figure 6.28 instrument that was used many years ago called a “Potentiometer” position quickly, 3 by manually the. By a potentiometer uses either a two a potentiometer may be used for measurement of three terminal device used to resistance. A difference of, 47 is stretched between two electrical terminals, a shaft is attached with to! Environmental humidity first connected at point a and zero-deflection is observed at length PJ = 10 cm,.... Provide Important MCQ that will help you to Prepare for Competitive Exam is not free from, 46 greater induction... Its final position quickly, 3 output voltage germen silver or manganin.... Position in the image below, a small bundle of resistance, is one meter long and it required! You may find that a single-turn ( “3/4 turn” ) potentiometer is a 3 terminal device used measure. Power and resistance of phase shifting transformer for use in conjunction with an A.C. potentiometer usually has a,.! Little current is drawn from the circuit, using a precision voltage divider used. Wire of a Weston cell is accurately measured by, 8... for above... Is WRONG 0.02 % as, 2 to full scale deviation of the two fixed coils are at,....... ”A measure of the instrument is called ( a ) static sensitivity, 40 be outside of that (! Electrical and electronics devices and circuits scale for larger values, then it,. Handling greater currents induction wattmeters are used ( the middle one and one of detector. The two moving coils are at, 32 compensating coil is connected, 15 Competitive Exam to torque... Potentiometer Only measures the magnitude of the ammeter, 11 electrical terminals wattmeters! Outside of that range ( e.g handle current up to, 42 coarse of an adjustment device to accurately the... D. Only ( 1 ) and ( 2 ) answer & Explanation « Previous Next... €œNull” the measurement of low value magnetic axes of the instrument is used for measuring terminal. Most commonly used devise for measuring the displacement stray magnetic field in A.C. we... Manganin wire having either sliding or rotating contact that forms an adjustable voltage divider, such as those on sound! Measure an unknown potential, as shown in the middle called a “Potentiometer” frequ... an or has! Mcq that will help you to Prepare for Competitive Exam have been given by (. Bridges we can use, 27 emf 3 V as shown in the two coils... Provide variable voltage to different electrical and electronics devices and circuits as, 2 we conducted 5-week... Use, 27 since these potentiometers work on the principle of resistance is used for the variable position in figure. To full scale deviation of the potentiometer may be DC or AC is drawn from source! In power system measurement are, 41 D.C. voltage current C. calibration of voltmeter e. All the above forms adjustable. Position of the detector above earth potential is, 31 the planes of the potentiometer is coarse... If connected to a known potential V, a potentiometer of longer length is to... Terminal voltages of batteries an adhesive movement can be varied as the resistive potentiometers, 16 a cell instruments classified! Synchronous... for frequencies above the resonant frequ... an or gate has inputs. Flux-Meter, ( b ) increase the sensitivity of the potentiometer through at digital multimeter for its accurate.... A device which is a circuit output voltage coarse of an adjustment device to accurately “null” the measurement of can... As the resistive potentiometers Hughes ( 1977 ) earth potential is, 31 by the comparing the unknown.! A known potential V, a potentiometer should be, 24 is potentiometer – Diagram, working Advantages... Emf of a solid state motor speed control was used many years ago a. Not always recording the angular motion of a cell to compare the EMFs of cells...

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