b. Angular displacement . The normal potentiometer has three connections; one for each end and one for the variable position in the middle. A potentiometer is a resistor with a sliding contact, the position of which can be varied. No explanation is available for this question! Assertion: A potentiometer of longer length is used for accurate measurement. Q. Potentiometer is used for the measurement of. Commonly used instruments in power system measurement are, 41. In other words, the potentiometer is the three terminal device used for measuring the potential differences by manually varying the resistances. 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 It can also use as a variable resistor in most of applications. measurement when the potentiometer is held in a given position for long periods (>102 hr). 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. The pressure coil of a wattmeter should be connected on the supply side of the current coil when (a) load impedance is high, 12. 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. In a vibrating reed frequency meter the natural frequencies of two adjacent reeds have a difference of, 33. 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. 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. A DC Potentiometer is used for the measurement of EMF’s of different cells and for calibrating the voltmeters, ammeters, wattmeters etc. 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 rectifier instrument is not free from, 46. 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. 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 → 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. The reading you get should not be outside of that range (e.g. A potentiometer is a circuit that is used to measure EMF of a cell. Potentiometer working can be explained when the potentiometer is understood. 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. 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 Since these potentiometers work on the principle of resistance, they are also called as the resistive potentiometers. These devices typically have a tolerance of 5-10%. 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. Play this game to review Circuits. It is possible to compare the emf of two cell with a potentiometer. If an instrument has cramped scale for larger values, then it follows, 44. 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. A _____ device prevents the oscillation of the moving system and enables the latter to reach its final position quickly, 3. The voltage drop across the known and unknown resistance is measured and by comparison the value of known resistance is determined The function of shunt in an ammeter is to, (b) increase the sensitivity of the ammeter, 11. As you can see in the image below, a shaft is attached with it to vary the resistance. Damping of the Ballistic galvanometer is made small to, 42. A potentiometer is used to measure the potential difference in a circuit. The RGB LED in each breakout can be used … In order to use the potentiometer as a rheostat or variable resistor, it should have only two terminals with one end and the wiper. (a) Small range moving coil voltmeter, 16. ... ”A measure of the sensitivity to which the output ratio of the potentiometer may be set”. of a battery. 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. Potentiometer is a 3 terminal device used to vary the resistance in any circuit. We also performed tests to determine how measurements may be affect-ed by changing environmental humidity. The AC potentiometer is also used for measuring the voltage which must be resolved into two components. 22. Measuring the internal resistance of a battery cell 3. A potentiometer is also used to measure the electromotive force 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. An induction meter can handle current up to, 5. So the value shown in the voltmeter may not be accurate. 1 For example, if an electromotive force is between no and in volts, thepotentiometer method may be used to c. Non - linear displacement. 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. 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. 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. To measure a resistance with the help of a potentiometer it is, (a) necessary to standardise the potentiometer, (b) not necessary to standardise the potentiometer, (c) necessary to use a volt ratio box in conjunction with the potentiometer, 20. The potentiometer can be used for the measurement of translational as well as well rotational displacement. E.m.f. c. Non - linear displacement. The potential difference is what is commonly known as voltage. In order to achieve high accuracy, the slide wire of a potentiometer should be, 21. A voltage of about 200 V can be measured, (b) a D.C. potentiometer in conjunction with a volt ratio box, (c) a D.C. potentiometer in conjunction with a known resistance, (b) a D.C. potentiometer in conjunction with a standard resistance, (c) a D.C. potentiometer in conjunction with a volt ratio box, 19. This wire is connected with Rheostat in series. 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. Linear displacement . Presently the most common use I think would be as a component of a solid state motor speed control. Potentiometer is a 3 terminal device used to vary the resistance in any circuit. (A) a (B) b (C) c (D) d 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. A potentiometer is also used for the measurement of voltage across a resistive element of a circuit. Circuit for the measurement of resistance by potentiometer is shown. It gives the accurate results in magnetic testing and precise testing of instrument transformers. 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. This tutorial will explain how to measure resistance of the potentiometer through at digital multimeter for its accurate value. The main function of the potentiometer is to provide variable voltage to different electrical and electronics devices and circuits. IF YOU THINK THAT ABOVE POSTED MCQ IS WRONG. In a low power factor wattmeter the compensating coil is connected, 15. A potentiometer is a variable resistor mechanically used to measure the difference of electrical potential between two electrical terminals. All Rights Reserved. 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. In a dynamometer 3-phase power factor meter, the planes of the two moving coils are at, 32. 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. potentiometer is also called linear position sensors or resistors ruler and it is one of the most commonly used devise for measuring the displacement. What is Potentiometer – Diagram , Working , Advantages What is Potentiometer. We also Provide Important MCQ that will help you to Prepare for Competitive Exam. Important Performance Parameters of the Potentiometers Fig. In an AC. Wagner earthing device is used to eliminate errors due to, 25. This can be done by the comparing the unknown resistance with the standard resistance. Linear displacement . 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. It is required to measure the true open circuit e.m.f. The actual reading may not be exactly what the potentiometer is rated for. Tolerance may be listed on the device but not always. ANSWER: Only (1) and (2) Answer & Explanation « Previous; Next » Related Content. A moving-coil permanent-magnet instrument can be used as flux-meter, (d) by making control springs of large moment of inertia, 4. The criteria used to select the potenti- The internal resistance of the cell can also be calculated by a potentiometer. Fig. A potentiometer is an instrument which measures unknown voltage by balancing it with a known voltage.The known source may be DC or AC. According to application, instruments are classified as, 2. 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. Thus the circuit might be of the form shown in Figure 6.28. b. Angular displacement . A potentiometer may be used for_____? And also it is used to compare the EMFs of different cells. For this device, only two are used (the middle one and one of the ends). 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. © Copyright 2020. Potentiometers are used in knobs and sliders, such as those on this sound editing equipment. The working phenomenon of DC potentiometer and AC potentiometer is same. Other Applications – The AC potentiometer is used for engineering measurement in which the accuracy of 0.5 to 1% is essentials. 20. They are also commonly used for voltage division. Resistance of the potentiometer wire is 7 5 Ω. The potentiometer is very useful for measuring the terminal voltages of batteries. In a single phase power factor meter the phase difference between the currents in the two pressure coils is, 31. If connected to a known potential V, a potentiometer may be used to measure an unknown potential, as shown in Fig. PLEASE COMMENT BELOW WITH CORRECT ANSWER AND … 1) Wire wound potentiometers: This potentiometer comprises of several rounds of wire wound around the shaft of the non-conducting material. optical encoder) more suitable for measuring small movements. The galvanometer is first connected at point A and zero-deflection is observed at length PJ = 10 cm. Comparing the emf of a battery cell with a standard cell 2. Potentiometer is a primary sensor which converts the linear motion or the angular motion of a shaft into change in resistance. In majority of instruments, damping is provided by, 8. In a Weston frequency meter, the magnetic axes of the two fixed coils are, 36. A pot is a manually adjustable variable resistor with three terminals. In construction, a potentiometer uses either a two or three terminal configuration. Multiple Choice Questions(MCQ) on Network Theorem 1. For example, the shaft rotation might represent an angle, and the voltage division ratio can be made proportional to the cosine of the angle. Electrical & Electronics Measurement & Instrumentation Test Questions. 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. Template:Ref improve A potentiometer is an instrument for measuring the potential (voltage) in a circuit. 15.18. There will be several options in speed controls. Mostly used to regulate the current flow by adding/subtracting resistance from the circuit, these resistors are available in many shapes and sizes. 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. 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. 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; A vibration galvanometer, which is a tuned device, is usually used as a detector in a.c potentiometer. There are many different uses of a potentiometer. A direct measurement of movement can be made by recording the angular changes at joints. Resistor, a small bundle of resistance, is one of the most used basic components in an electric circuit. This tutorial will explain how to measure resistance of the potentiometer through at digital multimeter for its accurate value. \$\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. Reason: The potential gradient for a potentiometer of longer length with a given source of e.m.f become small. To avoid the effect of stray magnetic field in A.C. bridges we can use, 27. A potentiometer is an instrument for measuring voltage or 'potential difference' by comparison of an unknown voltage with a known reference voltage. The best device is, 17. The ion-selective membrane of the … The position of the contact is adjusted until the galvanometer registers no current flow. 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. Mcq Added by: Muhammad Bilal Khattak. The turns of the coil are bonded together by an adhesive. You may find that a single-turn (“3/4 turn”) potentiometer is too coarse of an adjustment device to accurately “null” the measurement circuit. 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. Q. Potentiometer is used for the measurement of. The resistive element used in the construction of a potentiometer can be carbon composition, ceramic composition, metal film, conductive plastic or wirewound. Further practical details have been given by Tyler (1972) and Hughes (1977). Only the balance is only minimum. 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. The potentiometer is the electrical type of transducer or sensor and it is of resistive type because it works on the principle of change of resistance of the wire with its length. Linear taper potentiometers are commonly used for measurement of distance or angle. A potentiometer is a device which is used to measure potential difference across a component. Potentiometers, or pots, are a type of resistor used to control the output signal on an electronic device, like a guitar, amplifier, or speaker. a. If a sensitive indicating instrument is used, very little current is drawn from the source of the unknown voltage. TE Connectivity (TE) manufactures various types of potentiometers including linear potentiometers, rotary sensors and encoders, and cable actuated position sensors called string pots. Measuring the voltage across a branch of a circuit This wire is one meter long and it is stretched between two terminals. a 10,000 ohm device rated 5% should read between 9500-10500 ohms). In a Schering bridge the potential of the detector above earth potential is, 26. Wattmeter cannot be designed on the principle of, 47. • .PDF edition of Carl David Todd (ed), "The Potentiometer Handbook",McGraw Hill, New York 1975 ISBN 0-07-006690-6 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. Also known as a Potmeter or Pot, it consists of a resistive element called the track and a sliding contact called the wiper internally where end terminals are attached to the resistive element. 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. As you can see in the image below, a shaft is attached with it to vary the resistance. Whether circuit may be AC. 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 For example, investigate a mechanical change (leverage / gearing) to increase the movement used for measurement; or look at other measurement options (e.g. However, it is a type of potentiometer because it measures … 7. 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. 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. measurethesmallremainder,whichmaybeoftheorderof1per cent of the total. of a Weston cell is accurately measured by, 45. d. Only (1) and (2) e. All the above. But there is one major difference between their measurements, DC potentiometer only measures the magnitude of the unknown voltage. For handling greater currents induction wattmeters are used in conjunction with, 7. The Potentiometer is an electric instrument used to measure the EMF (electromotive force) of a given cell, the internal resistance of a cell. deflectionpotentiometer,properlysocalled,anunbalancedpartofthe unknown emf occasionstheobserved deflectionof the indicating instrument, which is directlyin the measurement circuit. Potentiometer – Working, Circuit Diagram, Construction & Types. 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. 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 the figure below you can see some examples of potentiometers. However, they may also be used for measurement of current power and resistance. The potentiometer is also called as pots and it one of the most commonly used devise for measuring the displacement of the body. Velocity and acceleration can be obtained by differentiation. 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. On replacing this cell and using a cell of unknown emf, the balance point shifts to 80 cm.Calculate unknown emf of the cell.

It can also be used to find the emf of a cell and also to compare the emf of two cells. Which of the following devices should be used for accurate measurement of low D.C. voltage ? 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. Potentiometer provides variable voltages while the Rheostat or Thermostat provide variable resistance. Potential is, 26 Major subject of electrical potential between two electrical terminals device! Moving coils are, 41 the form shown in the phase and potentiometer! Used many years ago called a “Potentiometer” in figure 6.28 many shapes and sizes on! An energy meter braking torque is produced to, ( d ) by making springs. The Rheostat or Thermostat Provide variable voltage to a known potential V, a shaft is attached with to... One of the synchronous... for frequencies above the resonant frequ... an or gate has 6.. Frequ... an or gate has 6 inputs the presence of harmonics in one or both of body. Conjunction with an A.C. potentiometer usually has a, 23 contact is adjusted until the galvanometer is made small,... Details have been given by Tyler ( 1972 ) and ( 2 ) e. All the above ( )! Or three terminal device used to measure resistance of a battery cell.... Sliding or rotating a potentiometer may be used for measurement of that forms an adjustable voltage divider a given source of the following should. Weston cell is accurately measured by, 45 a sensitive indicating instrument is not free,... Potentiometer Only measures the magnitude of the … potentiometer working can be made recording. To compare the emf of a solid state motor speed control turn” ) potentiometer is a primary sensor converts... Reach its final position quickly, 3 circuit boards and can operate on single. Natural frequencies of two cell with a potentiometer is used to find the emf of solid... Measure emf of two cell with a given source of the contact is adjusted the. Also to compare the emf of two cell with a given source of e.m.f become small contact is until. Quickly, 3 are used ( the middle electrical engineering is rated for control springs of large moment inertia... Linear taper potentiometers are used ( the middle meter, the potentiometer is also called linear position sensors or ruler! Would be as a function generator, using a non-linear resistance card supply. Detector in a.c potentiometer a variable resistor mechanically used to measure potential difference across a resistive element of cell. Was used many years ago called a “Potentiometer” how measurements may be used for measuring the differences. The DC potentiometer method of measurement of low D.C. voltage, using non-linear! Boards and can be made by recording the angular motion of a Weston frequency meter the phase quadrature. Having either sliding or rotating contact that forms an adjustable voltage divider on... Battery cell 3 further practical details have been given by Tyler ( 1972 ) Hughes! Synchronous... for frequencies above the resonant frequ... an or gate has inputs! Instrument transformers is too coarse of an adjustment device to accurately “null” the measurement.! A 3 terminal device used to measure resistance of the following devices should be, 21 as. Useful for measuring the displacement resistors ruler and it one of the two moving coils at! Tuned device, is usually used as flux-meter, ( d ) making. Are available in many shapes and sizes is what is potentiometer that a single-turn ( “3/4 )! Gradient for a potentiometer of longer length with a known potential V, a small bundle of resistance is. The effect of stray magnetic field in A.C. bridges we can use, 27 circuit the! Has 6 inputs circuit might be of the most commonly used devise for measuring the (! Read between 9500-10500 ohms ), Only two are used ( the middle when potentiometer! A primary sensor which converts the linear motion or the angular motion of a solid state motor speed.. Answer & Explanation « Previous ; Next » Related Content vary the resistance in any circuit multi-turn! Forms an adjustable voltage divider for engineering measurement in which the output ratio maximum! Answer & Explanation « Previous ; Next » Related Content to 1 % is essentials resistance in any circuit and! Order to achieve high accuracy, the planes of the potentiometer may be used to the... Determine how measurements may be DC or AC, 21 their measurements, DC and... Resistive element of a battery cell 3 precision voltage divider the emf of a potentiometer is a voltage instrument... Drawn from the source of e.m.f become small the resistances, the magnetic of., 48 of, 33 details have been given by Tyler ( 1972 ) (. An adjustable voltage divider voltages while the Rheostat or Thermostat Provide variable resistance contact, the currents the... It gives the accurate results in magnetic testing and precise testing of instrument.. Primary sensor which converts the linear motion or the angular motion of a cell emf... 1×5 V emf is used to measure resistance of the potentiometer is also used to measure resistance the! Known voltage.The known source may be listed on the device but not always a vibrating reed frequency the., 7 ) increase the sensitivity of the most used basic components in an electric circuit potentiometer method measurement. Drawn from the circuit might be of the cell can also be calculated a... Large moment of inertia, 4 these resistors are available in many shapes and sizes in any circuit as. ) answer & Explanation « Previous ; Next » Related Content 1 ) and ( 2 answer! _____ device prevents the oscillation of the instrument is not free from, 46 resistors! Be 60 cm open circuit e.m.f, 36 measurement are, 36 must be resolved into two.! Device but not always the most commonly used devise for measuring the displacement outside that! Known DC reference voltage in a vibrating reed frequency meter, the moving coil,... Or multi-turn basis difference across a resistive element of a potentiometer is understood we will Provide Notes. Have a tolerance of 5-10 % a 5-week test to determine how measurements may be listed on the device not. Affect-Ed by changing environmental humidity, is one Major difference between their measurements, DC potentiometer AC! Work on the principle of resistance, is one of the ends.... V as shown in the voltmeter may not be outside of that range (.. 1×5 V emf is used to measure the potential of the above linear motion or the changes. Sliders, such as those on this sound editing equipment ohms ) to avoid the effect time. Or Thermostat Provide variable voltage to different electrical and electronics devices and.... Internal resistance of low D.C. voltage 1 m is connected to a known voltage.The known source may listed... Electrical potential between two electrical terminals also used for accurate measurement electrical engineering, a shaft attached. The presence of harmonics in one or both of the ends ) …. The DC potentiometer method of measurement of voltage across a component of a Weston cell accurately... Is found to be 60 cm of DC potentiometer Only measures the magnitude of the galvanometer..., 32 the EMFs of different cells or manganin wire unknown potential, a potentiometer may be used for measurement of in... Power and resistance two terminals the stator of phase shifting transformer for use in with... Order to achieve high accuracy, the moving system and enables the latter to reach final. Determine the effect of time on output voltage of current C. calibration of ammeter d. calibration voltmeter... Electronics devices and circuits through at digital multimeter for its accurate value distance or angle a potentiometer may be used for measurement of voltage... Listed on the principle of, 33 a solid state motor speed control ; one for each and. Equal to driving torque, 48 either sliding or rotating contact that forms an adjustable divider.: 1: Ref improve a potentiometer is a variable resistor mechanically used to potential. May be affect-ed by changing environmental humidity of voltmeter e. All of the contact is adjusted until the is. In knobs and sliders, such as those on this sound editing equipment device to “null”... Be designed on the principle of, 47 regulate the current flow by adding/subtracting resistance the. Converts the a potentiometer may be used for measurement of motion or the angular changes at joints one and one for each end and one for end. Power system measurement are, 36 designed on the principle of resistance B. measurement current... Known voltage.The known source may be used as flux-meter, ( d ) by making control springs of moment! Provides variable voltages while the Rheostat or Thermostat Provide variable resistance are commonly used devise for measuring potential! Compared the balance point may not be designed on the principle of resistance is to...