{"id":2728,"date":"2020-11-08T10:00:30","date_gmt":"2020-11-08T18:00:30","guid":{"rendered":"https:\/\/www.linquip.com\/blog\/?p=2728"},"modified":"2023-04-17T09:03:52","modified_gmt":"2023-04-17T17:03:52","slug":"variable-resistor","status":"publish","type":"post","link":"https:\/\/www.linquip.com\/blog\/variable-resistor\/","title":{"rendered":"Variable Resistor\u2236 Learn The Basics, Get The Most out of It!"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_83 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.linquip.com\/blog\/variable-resistor\/#What_is_a_variable_resistor\" >What is a variable resistor?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.linquip.com\/blog\/variable-resistor\/#Variable_Resistor_Types\" >Variable Resistor Types<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.linquip.com\/blog\/variable-resistor\/#Variable_Resistor_Symbol\" >Variable Resistor Symbol<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.linquip.com\/blog\/variable-resistor\/#Variable_Resistor_Function\" >Variable Resistor Function<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.linquip.com\/blog\/variable-resistor\/#variable_resistor_Circuit\" >variable resistor Circuit<\/a><\/li><\/ul><\/nav><\/div>\n<p><span style=\"font-weight: 400;\">The resistor is one of the most common types of elements in electrical devices today. They are two-terminal components that will create a resistance to the flow of current. Resistors help to make the management of the current much simpler, and they are a common part of most electronics in today\u2019s world. In this article, Linquip will discuss what a <\/span><span style=\"font-weight: 400;\">variable resistor<\/span><span style=\"font-weight: 400;\"> is and how it works. Read on to find out more.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"What_is_a_variable_resistor\"><\/span>What is a variable resistor?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">It is an electronic component. It is applied in an electronic circuit for adjusting circuit resistance to control voltage or current of that circuit or part of that circuit. The electrical resistance is varied by sliding a wiper contact along a resistance track. Sometimes the resistance is adjusted at preset value as required at the time of circuit building by adjusting screw attached to it and sometimes resistance can be adjusted as when required by controlling knob connected to it. The active resistance value of the variable resistor depends upon the position of the slider contact on the resistance track.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">It mainly consists of a resistance track and a wiper contact. The wiper contact moves along the resistance track when the adjustable component is adjusted. There are mainly three different types of resistance track used in this resistor they are carbon track, cermet (ceramic and metal mixture) track, and wire-wound track. The carbon track and cermet track are used for high resistance application whereas the wire-wound track is used for low resistance <\/span><span style=\"font-weight: 400;\">variable resistor<\/span><span style=\"font-weight: 400;\">. The resistance tracks generally are circular but a straight track is also used in many cases.<\/span><\/p>\n<p><img decoding=\"async\" class=\"size-full wp-image-2737 aligncenter\" src=\"https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2020\/10\/64a984ff-5ab3-4fa8-b001-dbf8a9f375f7.jpg\" alt=\"variable resistor\" width=\"700\" height=\"700\" title=\"\" srcset=\"https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2020\/10\/64a984ff-5ab3-4fa8-b001-dbf8a9f375f7.jpg 700w, https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2020\/10\/64a984ff-5ab3-4fa8-b001-dbf8a9f375f7-300x300.jpg 300w, https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2020\/10\/64a984ff-5ab3-4fa8-b001-dbf8a9f375f7-150x150.jpg 150w, https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2020\/10\/64a984ff-5ab3-4fa8-b001-dbf8a9f375f7-696x696.jpg 696w, https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2020\/10\/64a984ff-5ab3-4fa8-b001-dbf8a9f375f7-420x420.jpg 420w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Variable_Resistor_Types\"><\/span>Variable Resistor Types<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">The different types of variable resistors include:<\/span><b><\/b><\/p>\n<ul>\n<li>\n<h3>Potentiometer<\/h3>\n<\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">The potentiometer is the most common <\/span><span style=\"font-weight: 400;\">variable resistor<\/span><span style=\"font-weight: 400;\">. This potential divider is used to generate a voltage signal depending on the position of the potentiometer.\u00a0\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The potentiometer consists of three terminals among which two are fixed and one is changeable. The two fixed terminals of the potentiometer are connected to both ends of the resistive element called track and the third terminal is connected to the slider or sliding wiper. The slider or wiper moving along the resistive track changes the resistance of the potentiometer. The resistance of the potentiometer is changed when the wiper is moved over the resistive path.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The potentiometer can be used for a wide variety of applications including Amplifier gain control (audio volume), measurement of distance or angles, tuning of circuits, and much more. When variable resistors are used to tune or calibrate a circuit or application, trimmer potentiometers or trim pots are used, this is mostly small potentiometers mounted on the circuit board, which can be adjusted using a screwdriver.<\/span><\/p>\n<ul>\n<li>\n<h3>Rheostat<\/h3>\n<\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">The word rheostat is derived from the Greek word \u201crheos\u201d and \u201c-statis\u201d which means a current controlling device or a stream controlling device. <\/span><span style=\"font-weight: 400;\">Rheostats are very similar in construction to potentiometers but are not used as a potential divider but as a variable resistance. They use only 2 terminals instead of the 3 terminals potentiometers use: one connected to an end of the track, the other to the moveable wiper. Turning the spindle changes the resistance between the two terminals from zero up to the maximum resistance.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">\u00a0In the past rheostats were used as power control devices in series with the load, such as a light bulb. Nowadays rheostats are not used as power control anymore as this is an inefficient method.\u00a0 For power control, rheostats are replaced by more efficient switching electronics. Preset variable resistors, wired as rheostats, are used in circuits to perform tuning or calibration, for example, to control the brightness of a lamp or the rate of charging a capacitor.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">If a rheostat is mounted on a printed circuit board all three terminals are usually soldered for better mechanical strength. The third terminal serves no electrical function but is usually linked to the wiper terminal.<\/span><\/p>\n<ul>\n<li>\n<h3>Digital Resistor<\/h3>\n<\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">A digital variable resistor is a type of <\/span><span style=\"font-weight: 400;\">variable resistor<\/span><span style=\"font-weight: 400;\"> where the change of resistance is not performed by mechanical movement but by electronic signals. They can change resistance in discrete steps and are often controlled by digital protocols such as I2C or by simple up\/down signals.<\/span><\/p>\n<ul>\n<li>\n<h3>Thermistor<\/h3>\n<\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">The word thermistor is derived from the combination of words: thermal and resistor. It is a type of resistor whose resistance changes when the surrounding temperature changes.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Thermistors are of two types: negative temperature coefficient (NTC) thermistors and positive temperature coefficient (PTC) thermistors.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The resistance of the NTC thermistors decreases when the temperature increases whereas the resistance of the PTC thermistors increases when the temperature increases.<\/span><\/p>\n<ul>\n<li>\n<h3>Magneto resistor<\/h3>\n<\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">The resistance of the magneto resistor changes when the magnetic field is applied to it. When the strength of the magnetic field applied to the magneto resistor increases, the resistance of the magneto resistor also increases. Similarly, when the strength of the magnetic field applied to the magneto resistor decreases, the resistance of the magneto resistor also decreases.<\/span><\/p>\n<ul>\n<li>\n<h3>Photoresistor<\/h3>\n<\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">The word photoresistor comes from the combination of two words: photon and resistor.\u00a0 The resistance of photoresistor changes when light energy is applied to it. The resistance of the photoresistor decreases when the intensity of applied light increases. There are two types of photoresistors based on the material used in constructing them. They are either intrinsic photoresistors or extrinsic photoresistors.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Photoresistors are also known as light-dependent resistors, semiconductor photoresistors, or photoconductors.<\/span><\/p>\n<ul>\n<li>\n<h3>Humistor<\/h3>\n<\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">The name humistor is derived from the combination of two words: humidity and resistor. Humistors are very sensitive to the humidity. The resistance of the humistor changes with a slight change in the humidity of the surrounding air. Humistors are also known as resistive humidity sensors or humidity sensitive resistors.<\/span><\/p>\n<ul>\n<li>\n<h3>\u00a0Force-sensitive resistors<\/h3>\n<\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">The name itself suggests that the force-sensitive resistors are very sensitive to the applied force. When we apply force to the force-sensitive resistor, its resistance changes rapidly. Force-sensitive resistors are also known as force sensors, pressure sensors, force-sensing resistors, or FSR.<\/span><\/p>\n<ul>\n<li>\n<h3>Presets<\/h3>\n<\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Presets are miniature versions of standard variable resistors. They are mounted directly onto circuit boards and adjusted only when the circuit is built. For example, they may be used to set the frequency of an alarm tone or the sensitivity of a light-sensitive circuit. A small screwdriver or similar tool is usually required to adjust presets.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Presets are available in vertical and horizontal styles. They are electrically identical but make sure you buy the correct type for your circuit board layout. Horizontal presets provide better mechanical strength on a circuit board.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Presets may be open (no case) or enclosed within a plastic case to protect them from dust and dirt. Because they are cheaper than standard variable resistors, they are often used in educational and hobby projects.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Multiturn presets are used where very precise adjustments are needed. The screw must be turned many times (10+) to move the slider from one end of the track to the other, giving fine control.<\/span><\/p>\n<h3>Variable Resistor Diagram<\/h3>\n<p><span style=\"font-weight: 400;\">As mentioned above, the way a <\/span><span style=\"font-weight: 400;\">variable resistor<\/span><span style=\"font-weight: 400;\"> works is simple. A sliding contact on a long coil of wire or length of graphite changes the amount of material in the circuit. The longer the length in the circuit, the higher the resistance and the smaller the current. So using it to turn the brightness of a bulb up and down the circuit diagram would be:<\/span><\/p>\n<p><img decoding=\"async\" class=\"size-full wp-image-2735 aligncenter\" src=\"https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2020\/10\/Diagram.jpg\" alt=\"variable resistor Diagram\" width=\"489\" height=\"314\" title=\"\" srcset=\"https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2020\/10\/Diagram.jpg 489w, https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2020\/10\/Diagram-300x193.jpg 300w\" sizes=\"(max-width: 489px) 100vw, 489px\" \/><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Variable_Resistor_Symbol\"><\/span>Variable Resistor Symbol<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">The following table shows the most common resistor symbols for electronic design.<\/span><\/p>\n<table>\n<tbody>\n<tr>\n<td style=\"text-align: center;\"><span style=\"font-weight: 400;\">Variable resistors<\/span><\/td>\n<td style=\"text-align: center;\"><span style=\"font-weight: 400;\">Symbols<\/span><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\"><strong>Potentiometer<\/strong><\/td>\n<td style=\"text-align: center;\"><img decoding=\"async\" class=\"size-full wp-image-2729 aligncenter\" src=\"https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2020\/10\/1-1.jpg\" alt=\"Potentiometer\" width=\"145\" height=\"81\" title=\"\"><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\"><strong>Rheostat\u00a0<\/strong><\/td>\n<td><img decoding=\"async\" class=\"size-full wp-image-2730 aligncenter\" src=\"https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2020\/10\/2.jpg\" alt=\"Rheostat \" width=\"162\" height=\"65\" title=\"\" srcset=\"https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2020\/10\/2.jpg 162w, https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2020\/10\/2-160x65.jpg 160w\" sizes=\"(max-width: 162px) 100vw, 162px\" \/><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\"><strong>Preset<\/strong><\/td>\n<td><img decoding=\"async\" class=\"size-full wp-image-2731 aligncenter\" src=\"https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2020\/10\/3.jpg\" alt=\"Preset\" width=\"146\" height=\"72\" title=\"\"><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\"><strong>Thermistor<\/strong><\/td>\n<td><img decoding=\"async\" class=\"wp-image-2732 aligncenter\" src=\"https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2020\/10\/4.jpg\" alt=\"Thermistor\" width=\"162\" height=\"95\" title=\"\" srcset=\"https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2020\/10\/4.jpg 220w, https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2020\/10\/4-218x129.jpg 218w\" sizes=\"(max-width: 162px) 100vw, 162px\" \/><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\"><strong>Magneto resistor<\/strong><\/td>\n<td><img decoding=\"async\" class=\"wp-image-2733 aligncenter\" src=\"https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2020\/10\/5.jpg\" alt=\"Magneto resistor\" width=\"197\" height=\"88\" title=\"\"><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\"><strong>Photoresistor<\/strong><\/td>\n<td><img decoding=\"async\" class=\" wp-image-2734 aligncenter\" src=\"https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2020\/10\/6.jpg\" alt=\"Photoresistor\" width=\"184\" height=\"113\" title=\"\" srcset=\"https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2020\/10\/6.jpg 885w, https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2020\/10\/6-300x185.jpg 300w, https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2020\/10\/6-768x473.jpg 768w, https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2020\/10\/6-696x429.jpg 696w, https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2020\/10\/6-682x420.jpg 682w, https:\/\/www.linquip.com\/blog\/wp-content\/uploads\/2020\/10\/6-356x220.jpg 356w\" sizes=\"(max-width: 184px) 100vw, 184px\" \/><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Variable_Resistor_Function\"><\/span>Variable Resistor Function<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Simply put, a variable resistor can have its electrical resistance adjusted. These devices are used when working with electrical circuitry because they help to control voltage and currents. They specifically work with voltage and currents that are a part of the circuit. The adjustability of these devices is simple. Each resistor comes with a wiper contact that can be slid up and down the resistance track. The <a href=\"https:\/\/en.wikipedia.org\/wiki\/Resistor#:~:text=A%20resistor%20is%20a%20passive,transmission%20lines%2C%20among%20other%20uses.\" target=\"_blank\" rel=\"noopener noreferrer\">resistor<\/a> can be adjusted at present values, which is a requirement of building the circuit. Later, a controlling knob that is connected can make adjustments. The wiper contact and where it sits on the resistance track is what determines the resistance value of the <\/span><span style=\"font-weight: 400;\">variable resistor<\/span><span style=\"font-weight: 400;\">.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"variable_resistor_Circuit\"><\/span>variable resistor Circuit<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Variable resistors are used to dynamically change the resistance to control the current in a circuit, and may also be used as a voltage divider. For example, they are used to control the volume on a radio. Potentiometers differ from regular resistors in that they have three terminals instead of two. The middle terminal is the &#8220;wiper.&#8221; When a potentiometer is used as a voltage divider, all three terminals are wired separately. But when the potentiometer is wired as a rheostat, only two connections are needed.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Either side of the <\/span><span style=\"font-weight: 400;\">variable resistor<\/span><span style=\"font-weight: 400;\"> may be attached to the circuit board, with the remaining side unattached or grounded, but it is important to always connect the wiper. The wiper must be grounded or affixed to the voltage source. For example, you can attach the left terminal of the pot to the voltage source and the wiper to the ground, or use the right terminal instead of the left. Changing the side affects the direction of rotation for the potentiometer&#8217;s maximum resistance.\u00a0<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">So, there you have a detailed description of a <\/span><span style=\"font-weight: 400;\">variable resistor<\/span> <span style=\"font-weight: 400;\">and its applications. <\/span><span style=\"font-weight: 400;\">If you enjoyed this article in Linquip, let us know by leaving a reply in the comment section. Is there any question we can help you with? Feel free to <a href=\"https:\/\/www.linquip.com\/sign-up?client_redirect=\/\" target=\"_blank\" rel=\"noopener noreferrer\">sign up<\/a> on our website to get the most professional advice from our experts.<\/span><\/p>\n<h3><b>Buy Equipment or Ask for a Service<\/b><\/h3>\n<p>By using Linquip RFQ Service, you can expect\u00a0to receive quotations from various suppliers across multiple industries and regions.<\/p>\n<p style=\"text-align: center;\"><strong><a href=\"http:\/\/linquip.com\/get-quote?utm_source=blog&amp;utm_medium=content&amp;utm_campaign=product_list&amp;utm_term=product_list&amp;utm_content=rfq\" target=\"_blank\" rel=\"noopener\">Click Here to Request a Quotation From Suppliers and Service Providers<\/a><\/strong><\/p>\n<p><em><strong>Read More In Linquip<\/strong><\/em><\/p>\n<ul>\n<li><span style=\"text-decoration: underline;\"><span style=\"font-size: 10pt;\"><strong><span style=\"font-family: verdana, geneva, sans-serif;\" data-sheets-value=\"{&quot;1&quot;:2,&quot;2&quot;:&quot;What is Shunt Resistor? + Function &amp; Applications&quot;}\" data-sheets-userformat=\"{&quot;2&quot;:1073857,&quot;3&quot;:{&quot;1&quot;:0},&quot;9&quot;:1,&quot;10&quot;:1,&quot;12&quot;:0,&quot;16&quot;:11,&quot;17&quot;:1,&quot;23&quot;:1}\" data-sheets-hyperlink=\"https:\/\/www.linquip.com\/blog\/what-is-shunt-resistor\/\"><a class=\"in-cell-link\" href=\"https:\/\/www.linquip.com\/blog\/what-is-shunt-resistor\/\" target=\"_blank\" rel=\"noopener\">What is Shunt Resistor? + Function &amp; Applications<\/a><\/span><\/strong><\/span><\/span><\/li>\n<li><span style=\"text-decoration: underline; font-family: verdana, geneva, sans-serif;\"><span style=\"font-size: 10pt;\"><strong><a class=\"in-cell-link\" href=\"https:\/\/www.linquip.com\/blog\/what-are-resistors-for-led-circuits\/\" target=\"_blank\" rel=\"noopener\">What Are Resistors for LED Circuits? 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