Resistance is a measure of how hard it is for electrons to move in an electrical circuit. A free powerpoint ppt presentation displayed as a flash slide show on id. If there is no tolerance band, then find the side that has a band closest to a lead and make that the first band. This circuit contains electronic components like resistors and capacitors but on a much smaller scale.
The table can also be used to specify the color of the bands when the values are known. Power rating of resistors in addition to having the required ohms value, a resistor should have a wattage rating high enough to dissipate the power produced by the current without becoming too hot. The rc circuit consider the resistor capacitor circuit indicated below. Integrated circuit can now output variety of pulse widths to the transistors on the hbridge. A potentiometervariable resistor allows you to change the voltage input that goes into the integrated circuit. Known as a composition resistor, they depend on the size of the piece of carbon.
Updated resistor color code pdf chart resistor color code pdf. The first resistor in the chart with 4 bands tells you the minimum information you can learn from a resistor. When modeled on a schematic, a resistor will show up as one of these two symbols. Resistor color code ppt software free download resistor.
Bring your own resistors to the seminar for testing and discuss your specific application with trained experts. Feb 19, 2015 powerpoint, with videos explaining what is resistance and how to combine resistor values. The power dissipation on the resistor generates a temperature rise against the local. Ppt understanding the resistor color code powerpoint. For example to select resistors and the dc source shown in figure 3 click on place. An automatic resistor calculator can be used to quickly find the resistor values.
Resistor color code chart the chart below shows how to determine the resistance and tolerance for resistors. Arnido jr instructor, colegio san agstin bacolod 2. Resistors are employed for many purposes such as electric heaters,telephone equipments, electric and electronic circuit elements and in current limiting devices. The resistor nominal value is encoded in the color code in powers of ten notation. You can find practical, colorful files in word, excel, powerpoint and pdf formats.
Lecture notes for analog electronics university of oregon. A fixed resistor is one for which the value of its resistance is specified or fixed and cannot be varied in general. Another question because i could not fit it on the last slide. Find powerpoint presentations and slides using the power of, find free presentations research about resistor testing ppt. Resistance and resistors introduction teaching resources. Just click the video when the ppt in in fullscreen. Resistors variable resistors are called potentiometers there is a fixed value of resistance between two terminals the moving part of the potentiometer is called the wiper resistors four band resistor colour code 1st band provides the first digit of the code 2nd band provides the second digit of the code 3rd band is the multiplier 4th band. Powerpoint, with videos explaining what is resistance and how to combine resistor values. Best powerpoint templates download your favorites today.
These are made of carbon dust or graphite paste and have low wattage values. Since voltage, current and resistance are related through. View and download powerpoint presentations on resistor testing ppt. A widely utilised approach to managing fault currents is the installation of neutral earthing resistors ners. If you continue browsing the site, you agree to the use of cookies on this website. What is a pullup resistor calculating a pullup resistor value resources and going further introduction pullup resistors are very common when using microcontrollers mcus or any digital logic device. Wirewound resistors, military, milprf26 qualified, type rw. This tutorial will explain when and where to use pullup resistors, then we will do a simple calculation to show why pullups are important. Power rating depends on the resistors construction. Updated explain the different types of resistors pdf. Without resistors we would be unable to build electrical circuits. This resistor is the secret to the wilkinson power divider, and is the reason that it is matched at ports 2 and 3, and the reason that ports 2 and 3 are isolated.
A larger physical size indicates a higher power rating. They are certainly helpful for any techie smart with their hands. All resistors generate heat as a product of their function. Steps in determining the value of the color coded resistor hold the resistor. Look for the 3 colors which they are near on each other. The power dissipated by the resistor is p vii2rv2r. Because current has passed through the series resistor, a voltage drop will occur across it. When looking at the chart, note the illustration of three round resistors with numerous color code bands.
Ppt resistance and resistors powerpoint presentation free. The completed wire wound resistor is coated with an insulating material such as baked enamel. If there is no tolerance band, then find the side that has. Note however, that the quarterwave transmission line sections make the wilkinson power divider a narrowband device. To rotate the components right click on the resistor to flip the component on 90. The magnitude of resistance is dictated by electric. Doc xls ppt to pdf converter 3000 is created as an easytouse and flexible converter which is designed to free batch convert word, excel, powerpoint to pdf with preserving the original text, graphics, images, layout etc. This combination of potentiometer, integrated circuit and pwm to the hbridge is the key to speed control. Resistor color code system resistor color coding system applies to carbon film resistors, metal oxide film resistors, fusible resistors, precision metal film resistors, and wirewound resistors cylindrical with enlarged ends of the axial lead type.
Power classification the greater the current that flows. The commonly used methods for fabricating integrated resistors are 1. This document is based on the learnbydoing principle because simply reading about a. Thick film, thin film, and bulk metal foil will be compared by subjecting each resistor to. Introduction to basic electronics, electronic components and projects. Chartstemplate provides a large number of free and handpicked feelings chart, which can be used for small, medium and largesized enterprises. What part do they play in a bar of or silver large copper learning radio theory lab experiments and for design and repair work after you become experienced in amateur radio.
Oct, 2009 resistors and resistance how they all add up slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. The other type of resistor is made of a piece of carbon. A resistor impedes the flow of electricity through a circuit. Therefore the voltage across the parallel resistors will not be the same as the voltage applied to the. In the above circuit current will flow through the series resistor and then divide at a and flow through both branches of the parallel combination. Resistor values will determine the value of a resistor based on the color bands or the reverse, it can display the color bands of a resistance value entered by the user. How to select resistors and avoid unforeseen stress factors vishay. Ners, sometimes called neutral grounding resistors, are used in an ac distribution networks to limit transient overvoltages that flow through the neutral point of a transformer or generator to a safe. In our previous post we saw that there are many different types of resistor available that can be used in both electrical and electronic circuits. Resistors operate on the principle that energy can be neither created or destroyed, only changed from one state to another. Variable resistors potentiometer or rehostat are able to change their values. Unit 5 resistors a potentiometer is a variable resistor used as a voltage divider.
In the case of the resistor, voltage is reduced by converting electrical energy into heat or thermal energy. Resistor powerpoint templates w resistorthemed backgrounds. Use the resistor color code chart below to understand how to use the color code system. Only approximate values of resistance can be had by this method. Resistor color code system how to read the resistor code.