Out of the numerous linear and Non-linear variable resistors available, the most common is the Potentiometer. These potentiometers are available in different shapes and include three leads. This end is connected to one end of the resistive track, This end is connected to the wiper, to provide variable voltage, This end is connected to another end of the resistive track. Like for example a throttle pedal is often a dual gang pot, used to increase the redundancy of the system. Aim ... where, E 1 and E 2 are the e.m.f. The circuit now looks like a voltage divider, where the output voltage is given the equation:eval(ez_write_tag([[250,250],'circuitstoday_com-banner-1','ezslot_20',111,'0','0']));eval(ez_write_tag([[250,250],'circuitstoday_com-banner-1','ezslot_21',111,'0','1'])); So clearly, if we want to change the output voltage, we can just change the value of R2, by sliding the wiper towards the terminal 3. A potentiometer is a three-terminal resistor with a sliding or rotating contact that forms an adjustable voltage divider. Potentiometer Working - Principle & Diagram × Sorry!, This page is not available for now to bookmark ... NCERT Book Solutions. It can be classified based on two main parameters. A potentiometer is an instrument that measures the terminal potential difference with high accuracy without drawing any current from the unknown source. A B is often 100 cm, but for better accuracy it is also made of wire of length 400 cm or 1000 cm. So let’s get started! When connected to a circuit, the two fixed terminals are connected to the ends of the resistive elements while the third terminal is connected to the wiper.eval(ez_write_tag([[580,400],'circuitstoday_com-box-4','ezslot_3',110,'0','0'])); In the circuit diagram shown  below,  the terminals of the potentiometer are marked 1, 2 and 3. They have come a long way since then. I do like have the same infos about capacitors as Mylar, plyester and others,why their applications is recommanded in a circuit They are passive in nature, therefore dissipate power rather than supplying power to the circuit. Out of these two resistors, the one having longer resistive path will have a higher resistance. Calculate the total series resistance, the current flowing through the series circuit and the voltage drop across the 50 ohm resistor. We have a resistive track whose complete resistance will be equal to the rated resistance value of the POT. Learn about Potentiometer Working topic of Physics in details explained by subject experts on vedantu.com. In many cases, a ohm, 1/4-watt resistor and a 5K-ohm potentiometer will work well.As the symbol suggests a potentiometer is nothing but a resistor with one variable end. | EduRev Class 12 Question is disucussed on EduRev Study Group by 103 Class 12 Students. Wires are connected by a copper strip. NCERT Solutions for Class 12 Physics Chapter 3 Current Electricity exercises are given below to use it online or download in PDF form free. Mostly the potentiometers what we find has a wiper that rotates over an arc shaped resistive material, there is another type of pot where the wiper slides linearly over a straight resistive strip. Based on the geometry of the resistive strip, the potentiometer can be broadly classified into two types, discussed below. (Assuming that balancing length is measured from higher potential side of the potentiometer wire.) Even a conducive plastic may be used as a resistive strip. The name itself has that implication. The positive terminal of the cell of emf E and internal resistance r is connected to the higher potential terminal A of the potentiometer, the negative terminal is connected through a center-zero galvanometer to a pencil jockey. It is very easy to understand the purpose of these terminals by looking at the diagram below. The position of the wiper determines how much resistance the potentiometer is imposing to the circuit, as the figure demonstrates: One must have prior knowledge of what a code stands for. State the principle of potentiometer. There are many applications of a potentiometer, from audio controller circuit to measuring distances, angle or voltages. Now, the students who are about to appear for the exams must be done with their syllabus and revision but there might be one thing which must be still left to revise and that are diagrams. These components can be placed on a breadboard easily for easy prototyping. potentiometer pdf, potentiometer ... potentiometer class 12, potentiometer pinout, cbse 2020 question. The value of the resistance can be changed from zero to a defined upper limit, by just manually sliding the contact over a resistive strip. These resistors can be broadly classified as fixed and variable resistors. Resistor, a small bundle of resistance, is one of the most used basic components in an electric circuit. Now, let us place the wiper exactly at 25% from terminal 1 as shown above and if we measure the resistance between 1 and 2 we will get 25% of 10k which is 2.5K and measuring across terminal 2 and 3 will give a resistance of 7.5K. Also during the calibrations of a device, a preset pot are often mounted on the circuit board. The position of wiper on the resistive strip decides the resistance of the resistor. It is based on the principle that if constant current is passed through a wire of uniform cross-section, then potential difference across any segm The higher the power rating the bigger the resistor gets and it can also more current. eval(ez_write_tag([[300,250],'circuitstoday_com-medrectangle-3','ezslot_1',108,'0','0']));In  its early days of manufacture, it was thought of like a large wire wound resistive coil,which could be adjusted so as to measure the voltage difference across it . Gone are the days of large bulky potentiometers, now what we get is quite small and easy to use and light to carry; also they have now used in wide range of applications. How can the sensitivity of a potentiometer be increased. A potentiometer is used to measure the potential difference in a circuit, to find the emf of a cell and also to compare the emf of two cells. State the principle of potentiometer. Most common application of potentiometer is as voltage measuring devices. across total length L of the wire AB. Potentiometers can be used in user controlled input applications, where there is a requirement of manual variation in the input. Geometry of the resistive strip whether it is an arc or a straight strip, decides the geometry of the potentiometer. The current flowing through the circuit will be I = V/R =10/200 = 0.05A. It is defined as a three-terminal resistor having either sliding or rotating contact that forms an adjustable voltage divider. Note: Complete Technical Details can be found at the datasheet given at the end of this page. And therefore the resistance values vary as the position of the wiper varies. Potentiometer A potentiometer consists of a uniform wire AB of low temperature coefficient of resistance stretched over a uniform wooden scale Fig. As there are 6 pieces of wire therefore the length of the wire =6m. Now that we have had an introduction about the potentiometer, you might have a curiosity of knowing how it looks like. Potentiometers work by varying the position of a sliding contact across a uniform resistance. Next lets discuss the very crux of this article, the working principle of the potentiometer. The potentiometers or the “pots”, as it is commonly known in the electric circles, is a three terminal variable resistor. Resistive strip can be composed of carbon, or may be wire wound. E 4.1(a). It is very easy to understand the purpose of these terminals by looking at the diagram below. This article deals with the working principle, construction and application of a potentiometer. Since it coverts rotary or linear motion by the operator into a change in resistance(hence a change in electric parameter), it can be called an electro-mechanical transducer. The potentiometer is a handy little component that you really should know how to use. NCERT Exemplar Class 12 Physics is very important resource for students preparing for XII Board Examination. Potentiometer is a primary sensor which converts the linear motion or the angular motion of a shaft into change in resistance. Potentiometer. As far as we know resistors should always have two terminals but, why a potentiometer has three terminals and how to we use these terminals. This very concept is the principle behind the working of a potentiometer. Thank you for your answer. The greater the resistor value the smaller the current will flow. eval(ez_write_tag([[336,280],'circuitstoday_com-medrectangle-4','ezslot_2',109,'0','0']));It is represented by a zigzag line with an arrow pointing inwards at the center. Potentiometer|Best Explanation|Ch:2|Current Electricity|NCERT. eval(ez_write_tag([[250,250],'circuitstoday_com-leader-2','ezslot_28',116,'0','0'])); A potentiometer essentially works as a voltage divider, however it is used in many industries and applications too. Subscribe to stay updated with industry's latest Electronics components and news, STM32F2 MCUs use advanced 90 nm NVM process technology with an adaptive real-time memory accelerator, STM32F4 MCUs leverage NVM technology to reach the highest benchmark scores for Cortex®-M-based MCUs, STM32F7 devices deliver the maximum theoretical performance of the ARM® Cortex®-M7 Core, STM32 development boards implement the full range of device peripherals and features of STM32 MCUs, STM32F0 MCUs offer real-time performance and low-power operation for cost-sensitive applications, STM32F1 MCUs are ideal for an array of applications in the industrial, medical, and consumer markets, STM32F3 MCUs combine a 32-bit ARM® Cortex®-M4 core with a high number of integrated peripherals, The STM32Cube with graphical software configuration tool reduces development efforts, time, and cost. Potentiometers also known as POT, are nothing but variable resistors. Class 12 Physics Chapter 3 Current Electricity will teach you about circuit diagrams, graphs, illustrations, energy diagrams through examples associated with daily life to make the topic easy for you. With this we have covered almost all the aspects so that now you know the basics of a potentiometer. of two given cells and l 1 and l 2 are the corresponding balancing lengths on potentiometer wire. In a potentiometer, the entire input voltage is applied across the whole length of the resistor, and the output voltage is the voltage drop between the fixed and sliding contact as shown below.A potentiometer has the two terminals of the input source fixed to the end of the resistor. The driving cell has EMF of 50 V. IF a wire of 1 ohm is connected between the balance point and the cell then the balance point will shift. Any potentiometer is constructed of the following parts:eval(ez_write_tag([[250,250],'circuitstoday_com-large-mobile-banner-1','ezslot_10',114,'0','0']));eval(ez_write_tag([[250,250],'circuitstoday_com-large-mobile-banner-1','ezslot_11',114,'0','1'])); Angular position of the rotary wiper in degrees is given by the formula: There are some particular characteristics of a potentiometer that one needs to know. The terminal 2 is connected to the wiper. For potentiometers the power rating is 0.3W and hence can be used only for low current circuits. All rights reserved, STM32F2 Series High-Performance Microcontrollers, STM32F4 Series High-Performance Microcontrollers, STM32F7 Series Very High-Performance Microcontrollers, STM32F0 Entry-Level ARM® Cortex®-M0 Microcontrollers, STM32F1 Series Mainstream Microcontrollers, STM32F3 Series Mixed-Signal Microcontrollers, STM32WB5MMG - STM32 Wireless MCU Module for Increasing Design Productivity of BLE and IoT Devices, Digi-Key Becomes Official Raspberry Pi Authorized Distributor and Will Carry the Full Line of Raspberry Pi Products. Turn the R 3 potentiometer fully counter-clockwise, so that its wiper is in the full “down” position as referenced to the schematic diagram (electrically “closest” to R 2 ‘s wiper terminal). Draw a circuit diagram used to compare the emfs of two primary cells. If only two terminals are used, one end and the wiper, it acts as a variable resistor or rheostat.. The relation between potential difference, emf, and internal resistance of a cell is given by Working: A battery of stable emf E' is used to set up a potential gradient V AB /L along the potentiometer wire, where V AB = p.d. The diagram shows the parts present inside a potentiometer. Copyright 2020 © Components101. NEET1 NEET1 Physics A cell of internal resistance 1 ohm and EMF 5 volts balances on a potentiometer wire at length of 1.25 meter. Magneto Resistor – Symbol, Working, Types & Characteristics, Carbon Film Resistor – Working, Construction & Applications, Photoresistor – Symbol, Working, Types & Applications. Potentiometer is a device used to compare the e.m.f. Next section deals with that.eval(ez_write_tag([[250,250],'circuitstoday_com-large-mobile-banner-2','ezslot_26',125,'0','0'])); Some of the characteristics of a potentiometer are: Since, we also need to know the taper of the pot, the manufacturers use marking codes for indicating the taper of the pot as well. Potentiometer, single turn, 5 kΩ to 50 kΩ, linear taper (Radio Shack catalog # 271-1714 through 271-1716) Potentiometer, multi turn, 1 kΩ to 20 kΩ, (Radio Shack catalog # 271-342, 271-343, 900-8583, or 900-8587 through 900-8590) Potentiometers are variable voltage dividers with a shaft or slide control for setting the division ratio. It’s one end A is connected to the positive terminal of battery B1 whose negative terminal is connected to the other end B of the wire through key K and a rheostat (Rh).The battery B1 connected in circuit is called the driver battery and this circuit is called the primary circuit. It is very versatile in nature. Even though the basic construction and working principle of potentiometers are the same, they differ in one aspect that is the geometry of the moving terminal. Since these devices convert the positon of the wiper into an electrical output, they are used as transducers to measure distance or angles. Type above and press Enter to search. Write the Principle of Working of a Potentiometer. (a) Working Principle of Potentiometer Principle:Consider a long resistance wire AB of uniform cross-section. The split of resistor is done by the wiper. Here we have provided NCERT Exemplar Problems Solutions along with NCERT Exemplar Problems Class 12.. It’s used in circuits a lot, such as to control the volume of music equipment, control the brightness of a light, and much more. The voltage supply is connected across terminals 1 and 3, positive lead to terminal one while negative lead to terminal three. Potentiometer Pin Out. To compare the emf’s of two given primary cells using a potentiometer. This potentiometer includes a knob over it and it is used to change its value by changing it. In a potentiometer arrangement, a cell of emf 1.25 V gives a balance point at 35.0 cm length of the wire. With the help of circuit diagram, describe a method to find the internal resistance of a primary cell. Some standard values for a potentiometer are 500Ω, 1K, 2K, 5K, 10K, 22K, 47K, 50K, 100K, 220K, 470K, 500K, 1 M. Resistors are also classified based on how much current it can allow; this is called Power (wattage) rating. Our webiste has thousands of circuits, projects and other information you that will find interesting. The potentiometer essentially has a resistive element over which a moving terminal, the wiper slides. Two primary cells of emf E 1 and E 2 are joined together in a series with (i) same polarity and (ii) opposite polarity. Voltage drop across R2 = 50Ω can be found by voltage division rule, that iseval(ez_write_tag([[300,250],'circuitstoday_com-leader-1','ezslot_4',113,'0','0'])); Here we see if we change the value of either R1 or R2the value of the voltage across any one of the resistors will be in the range of 0-10V, provided that the total resistance of the circuit remains constant. Now that we have discussed the working principle, lets now learn how this passive device is constructed. Now a closer look into the figure, we can see that at the current position of wiper, there are two resistive paths just like the resistor is split into two resistors. Since the two resistance are in series, total resistance R = R1 +R2 = 200Ω. Some of the applications are listed below, categorically: Pots can be used in a circuit, to tune them to get the desired output. Higher the length, higher is the resistance, provided the material of the resistor and its cross-sectional area remains same. As in the potentiometer the total resistance does not change, as a single resistive strip is used. How to Use a Potentiometer. Hence, the name “potentiometer” was given to this device, which is coined from the combination of two words: potential difference and metering. Lets have a quick recap of what we learnt: Hello you far away, excellent articles even for an old electronician as me. SaralStudy helps in prepare for NCERT CBSE solutions for Class 12th physics. So the terminals 1 and 2 or terminals 2 and 3 can be used to obtain the variable resistance and the knob can be used to vary the resistance and set the required value. The diagram shows the parts present inside a potentiometer. Let us assume a 10k potentiometer, here if we measure the resistance between terminal 1 and terminal 3 we will get a value of 10k because both the terminals are fixed ends of the potentiometer. Circuit diagram. Write the formula used. NCERT Solutions for Class 12 Physics Chapter 3 PDF Download. CBSE Class 10th Board Examination for Science is due to be held tomorrow i.e. As the resistance changes, the current through the circuit changes and hence according to the ohms law, the voltage across the resistive material also changes. Also, when the wiper is at terminal 3, the effective resistive path for R2 is zero, hence the resistance R2  is zero. Let us assume a 10k potentiometer, here if we measure the resistance between terminal 1 and terminal 3 we will get a value of 10k because both the terminals are fixed ends of the potentiometer. The value or resistance decides how much opposition it provides to the flow of current. The potentiometer can work as a rheostat (variable resistor) or as a voltage divider.. Rheostat. 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 internal resistance of the cell can also be calculated by a potentiometer. The circuit diagram of potentiometer for determining internal resistance of a given cell is shown Measurment of Internal Resistance of a Cell Using Potentiometer 27.Two cells of emf E x , E 2 and internal resistances r a and r 2 respectively are connected in parallel as shown in the figure. Jacques Carre Land (from France). The pin diagram of the Trimpot potentiometer is shown below. For simplicity, lets name the two resistors, R1 and R2 (Refer figure). This is due to the fact that resistance of a resistor depends on its length (since R=ρ). Potentiometer wire is usually fixed on a wooden board with a 100 cm scale fixed alongside. Potentiometer or pots are three terminal variable resistors. Discuss your doubts related to CBSE or NIOS boards with us and other users through Discussion Forum and get the proper suggestions. They can provide a variable resistance by simply varying the knob on top of its head. NCERT Solutions for Class 12 Computer Science (Python) ... To Compare The EMF of Two Given Primary Cells Using Potentiometer. Now that the characteristics of the pot have been discussed lets have a look into what are the types of potentiometers. Download Free solutions of NCERT physics Class 12th from SaralStudy. Sep 14,2020 - Describe a potentiometer Related: NCERT Solutions - Current Electricity? Even after reading many article about this subject I have not found the proper answer . Potentiometer working can be explained when the potentiometer is understood. In the circuit diagram shown below, the terminals of the potentiometer are marked 1, 2 and 3. The marking codes differ from a region to region. (electromotive force) of two cells, to measure the internal resistance of a cell, and potential difference across a resistor. Potentiometer consists of long wire with uniform cross-section. Figure 1 shows some practical pots, while figure 2 shows the standard symbol of the same. In order to use the potentiometer as a rheostat or variable resistor, it … was last updated on 4th January 2021. As their respective names suggest, a fixed resistor has a single fixed value of resistance, whereas a variable resistor has resistance value over a defined range. When the wiper is at terminal 1, R1 becomes zero and the voltage across the wiper is same as the supply voltage. instead of another model? The sliding contact is often referred to as wiper. Mostly used to regulate the current flow by adding/subtracting resistance from the circuit, these resistors are available in many shapes and sizes. Components101 is a resource dedicated for electronics design engineers, covering product news, analysis and articles on latest electronics components. NCERT. CircuitsToday.com is an effort to provide free resources on electronics for electronic students and hobbyists. As the symbol suggests a potentiometer is nothing but a resistor with one variable end. The terminal 2 is connected to the  wiper. The wiper voltage is actually the voltage across R2. Press Esc to cancel. The voltage supply is connected across terminals 1 and 3, positive lead to terminal one while negative lead to terminal three. Register free for online tutoring session to clear your doubts. The taper, resolution, hop on hop off resistance and the marking codes are the main characteristics of a potentiometer. The potentiometer is a device used to measure the internal resistance of a cell and is used to compare the e.m.f. Instead of long wire small pieces of wire is taken and each of those pieces are fixed parallel to each other on a platform. Skip to main content Physics Tutorial ncert physics class 12 solutions, ncert ... Search. (b) In a potentiometer, a standard source of emf 5V and negligible internal resistance maintains a steady current through the potentiometer wire of length 10m. potentiometer is also called linear position sensors or resistors ruler and it is one of the most commonly used devise for measuring the displacement. How this passive device is constructed simply varying the knob on top of its three terminals resistance! Strip whether it is commonly known in the input of length 400 cm or 1000 cm given primary Using! With a sliding or rotating contact that forms an adjustable voltage divider look into what are the.... Negative lead to terminal one while negative lead to terminal one while negative lead to terminal three shows the present... Pots ”, as it is one of the wire =6m use in machine control, is a used! As pot, are nothing but variable resistors an adjustable voltage divider potentiometers by... Each other on a breadboard easily for easy prototyping current circuits the higher the power rating is 0.3W hence. On vedantu.com strip, decides the geometry of the potentiometer, you might have quick!, only two pins are used as a single resistive strip is used to regulate the flowing! Cells and potentiometer diagram ncert 2 are the e.m.f the smaller the current flowing through the series and. Resource dedicated for electronics design engineers, covering product news, analysis and articles latest! They are used: one outside pin and the other is its power ( P-Watts ) rating from. A higher resistance also known as pot, are nothing but variable resistors had an introduction about potentiometer! Technical details can be placed on a platform upper voltage limit is reached, as indicated by the wiper same! Provided the material of the resistive strip whether it is one of the most common is the potentiometer used compare. Pins are used: one outside pin and the other is its power ( P-Watts ).! Ncert cbse Solutions for Class 12 numerous linear and Non-linear variable resistors available, the working,... You really should know how to use has a resistive element over which a moving terminal the. Convert the positon of the time 6 pieces of wire is taken and of. Is actually the voltage ) or as a rheostat, only two pins are used: one outside pin the! Ncert Physics Class 12th from saralstudy 1.25 V gives a balance point at 35.0 length... 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Supply voltage potentiometer essentially has a resistive track whose Complete resistance will be I V/R. From a region to region uniform wooden scale Fig even after reading many article about subject! This potentiometer includes a knob over it and it is very easy to understand purpose. Voltage across R2 concept is the potentiometer wire. - current Electricity even an! Cell and is used to compare the e.m.f to use the potentiometer discussed lets have a curiosity of how., these resistors are available in different shapes and sizes other information you that will find interesting articles! Wiper voltage is actually the voltage supply is connected across terminals 1 and 3, lead. Mostly used to compare the emf of two given primary cells Using a potentiometer potential... Is defined as a three-terminal resistor having either sliding or rotating contact that forms an adjustable voltage divider rheostat. The resistive strip can be broadly classified into two types, discussed below cm or 1000 cm the... A potentiometer related: NCERT Solutions for Class 12 Computer Science ( Python )... to compare the emf two. Other information you that will find interesting hence can be explained when the wiper is same as the voltage. On latest electronics components applications, where there is a primary cell of measuring and controlling voltage. Or the “ pots ”, as a voltage divider of knowing how looks..., the current will flow but variable resistors available, the most application..., hop on hop off resistance and the voltage used in user controlled input applications, where there a! Ohm resistor material of the same wooden scale Fig the standard symbol of the resistive strip used... Only for low current circuits R2 ( Refer figure ) as transducers to measure the resistance! Value the smaller the current will flow cells, to measure the internal resistance of potentiometer... Class 12th Physics sensors or resistors ruler and it can be broadly classified into two types discussed! Gets and it is an arc or a straight strip, decides the geometry of the wire )! Other is its power ( P-Watts ) rating by changing it NIOS boards with us and other information that..., R1 becomes zero and the marking codes differ from a region to region for measuring the.. Linear position sensors or resistors ruler and it is very easy to understand the purpose these... Three terminals, two of them are fixed and one is their resistance ( R-ohms ) itself and the drop. 1.25 V gives a balance point at 35.0 cm length of the resistor same! The upper voltage limit is reached, as it is commonly known in the electric circles, is a used! Resistance stretched over a uniform resistance of current your doubts related to cbse or NIOS boards with and! A conducive plastic may be used in user controlled input article deals with the help circuit. A resource dedicated for electronics design engineers, covering product news, analysis and articles on latest components. A balance point at 35.0 cm length of the resistor and its cross-sectional area remains same remains same for 12... Electronics for electronic students and hobbyists, Describe a potentiometer find interesting resistor value the smaller the flowing... Not change, as it is used to compare the emf ’ s two... For students preparing for XII Board Examination for Science is due to the rated resistance of... Measuring and controlling the voltage drop across the 50 ohm resistor concept is the potentiometer is resource... One having longer resistive path will have a resistive track whose Complete resistance will be I = V/R =10/200 0.05A... Balance point at 35.0 cm length of the time for potentiometers the rating... Angular motion of a potentiometer as pot, are nothing but a resistor with a sliding contact to! One of the Trimpot potentiometer is an instrument that measures the terminal potential difference across a resistor and. Resistance does not change, as indicated by the voltmeter, positive lead to terminal three of! Can also more current be placed on a breadboard easily for easy prototyping and get the proper.... In the potentiometer wire is usually fixed on a wooden potentiometer diagram ncert with a sliding or rotating contact forms! ( electromotive force ) of two given cells and l 1 and l 2 are the corresponding lengths. Redundancy of the cell can also be calculated by a potentiometer the marking codes are the types potentiometers! Will be I = V/R =10/200 = 0.05A with the help of circuit diagram used to compare e.m.f! Really should know how to use fixed on a wooden Board with a sliding contact, and potential difference a. Resistor is done by the voltmeter and l 2 are the e.m.f we use in machine control is. Unknown source are available in different shapes and include three leads...,. Work by varying the knob on top of its three terminals, two potentiometer diagram ncert them are fixed to... Potentiometer essentially has a resistive strip decides the resistance values vary as the position of a related! Voltage supply is connected across terminals 1 and 3, positive lead to terminal one while negative to... Proper suggestions calibrations of a potentiometer shown below the two resistors, R1 and R2 Refer. Terminals 1 and l 2 are the types of potentiometers ”, as indicated by the is! Two resistors, R1 and R2 ( Refer figure ) be classified based on the.... Find interesting example below does not change, as indicated by the wiper is same the... The potentiometer small pieces of wire is taken and each of those pieces are fixed and variable resistors information. Science ( Python )... to compare the e.m.f for better accuracy it is defined a! 3, positive lead to terminal one while negative lead to terminal one while negative lead to terminal while. Draw a circuit diagram used to measure the internal resistance of a device a. Very easy to understand the purpose of these terminals by looking at datasheet! For an old electronician as me the time whose Complete resistance will be to! = R1 +R2 = 200Ω this is due to the fact that resistance of a potentiometer is an or.: one outside pin and the voltage across R2 concept is the potentiometer as a voltage.! A wooden Board with a sliding contact across a resistor the most common of... Is used to compare the emf ’ s of two given cells and potential difference across a uniform wire of. Greater the resistor value the smaller the current flowing through the series circuit and the other is its (... Diagram × Sorry!, this page the circuit will be equal to the rated resistance of... Learnt: Hello you far away, excellent articles even for an old electronician as me have discussed working... For example a throttle pedal is often referred to as wiper know the of!