The resistor colour code system is all well and good but we need to understand how to apply it in order to get the correct value of the resistor. Series resistor in data lines electrical engineering stack. If you want to find out the color bands for a value. Select the number of bands, then their colors to determine the value and tolerance of the resistors or view all resistors digikey has to offer. This type of resistor is commonly used for making printed circuit boards. The first stripe is the one thats closest to one end of the resistor. When looking at the chart, note the illustration of three round resistors with numerous color code bands. For high voltage resistors often the colors gold and silver are replaced with yellow and gray. The value for the selected band is expressed in terms of ohms. Generally, if an additional fifth band is black, the resistor is a wirewound resistor. Updated resistor color code pdf chart resistor color code pdf.
In electronic circuits, resistors are used to reduce current flow, adjust signal levels, to divide voltages, bias active elements, and terminate transmission lines, among other uses. Ruge in 1938, is a type of resistor that changes value with applied strain. However the silver stripe indicates that it is a 10% tolerance resistor and can have an actual value of 2070 to 2530 ohms. So, for a 560 ohm, 5% resistor the color stripes will be green, blue, brown and gold. Vishay resistors are available at mouser electronics.
In the resistor shown in the preceding figure, the twodigit number is 47 and the multiplier is 10, so the nominal value is an easy way to multiply a whole number by a power of 10 that is, 10 0, 10 1, 10 2, 10 3, and so on is to just append meaning tack on to the end the whole number with zeros, and use the exponent which is the small. 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. How to read a resistor resistors are one of the main building blocks of a circuit. Resistors are available with ratings from as low as 18 watt to hundreds of watts. Since the average resistor is too small to have the value printed on it, the resistance value is displayed using the color code the colored barsthe colored stripes. Resistor color code calculator and chart 4band, 5band or 6. In this video you will learn how to read the resistor color code by using the color code chart. The calculator above will display the value, the tolerance and performs a simple check to verify if the calculated resistance matches one of the eia standard values. A resistor may have one or more fixed tapping points so that the resistance can be changed by moving. They come in a large range of values to fit any type of circuit design. Resistors are color coded with markings or bands that allow you to quickly identify resistance values and tolerance. Types of resistors the two main characteristics of a resistor are its resistance, r, in ohms and its power rating, p, in watts.
Resistor colour code and resistor tolerances explained. The third stripe gives the number of zeros power of ten, and the fourth stripe is the tolerance. As the name suggests, these components act just like a resistor, except that the resistance changes in response to how much light is falling. Most axial resistors use a pattern of colored stripes to indicate resistance. The gold stripe means the actual value of the resistor mar vary by 5% meaning the actual value will be somewhere between 6,460 ohms and 7,140 ohms. These correspond to the first two digits of the resistor value. This is ballast resistor, the life saving device of led. A larger physical size indicates a higher power rating. The fourth stripe gives you the resistors tolerance that is, it tells you how close to the indicated value you can expect the resistance to actually be.
You are given a resistor whose stripes are colored from left to right as green, brown, black, gold. If you have a lvcmos33 driver with 8 ma drive strength and datasheet says the vol is 0. Thus, if stripe a is green, b is grey, e is red, and. Resistor color code system how to read the resistor code. If there is no tolerance band, then find the side that has. Finding the value of a resistor by reading its color codes. A further surface mount resistor code scheme or smd resistor coding scheme has started to be used, and it is aimed at 1% tolerance smd resistors, i. To discern the specific values for a circuit, the resistors are marked with color coded bands that have a different number per color, as well as the tolerance of the resistor. A resistor is identified by its pattern of color of bands. Surfacemount resistors are marked numerically, if they are big enough to permit marking. Electronicscomponent identification wikibooks, open books.
Value of the resistor if the factor that determines the. A resistor is a passive twoterminal electrical component that implements electrical resistance as a circuit element. Given a resistor with red, orange, red and silver stripes you can see that the nominal resistance value should be 2. This tool is used to decode information for color banded axial lead resistors. If this stripe is on the right side of the resistor, turn the resistor around so the first stripe is on the left. This is to prevent having metal particles in the coating. Use our online calculator to determine the resistor value. To calculate the value of a resistor using the color coded stripes on the resistor, use the following procedure. Green and blue are the first significant digits 56. When modeled on a schematic, a resistor will show up as one of these two symbols.
If the power rating of a resistor is too low for a par ticular. The value of the resistor is marked on the body using colors. To use this tool, simply click on a particular color and number and watch how the actual bands on the resistor illustration change. The first resistor in the chart with 4 bands tells you the minimum information you can learn from a resistor. Every color is different number and you can remember these numbers or you can just use the table on next step. Or there are much resistor calculators that you can use. If an additional fifth band is white, the resistor is a fusible resistor. Resistor color code calculator 3, 4 and 5 band resistors. Look at the color of the first two stripes on the left end. Led series resistor value calculation led always has a series resistor along with it. Position the resistor with this band on the right side and again read your resistor from left to right. Watch this video to learn more about how to read a.
Our resistor color code calculator is a handy tool for reading carboncomposition resistors whether its a 4band, 5band or 6band type. Sep 10, 2012 in this video you will learn how to read the resistor color code by using the color code chart. Heres how you use the color code to figure out the nominal value of the resistor refer to the figure. This is an international and universally accepted method, developed many years ago as a simple and quick way of identifying a resistors ohmic value no matter what its size or condition. As higher tolerance resistors are used, further figures are needed. Updated resistor color code pdf chart resistor color. Power rating depends on the resistors construction. With that knowledge, realize that on a fourband resistor the third color will always be blue 106 or less and on a fiveband resistor, the fourth color will always be green 105 or less. The first three color bands represent significant digits, the. The second stripe gives the second digit of the resistance.
Finding the value of a resistor by reading its color. Working of resistorsresistance,unit,symbol,types,colour. The resistance, r, provides the required reduction in current or the desired drop in voltage. Simply enter the resistors band colors, and the calculator will display the value in ohms. How to read color codes from resistors the value of the resistor is marked on the body using colors.
Resistor values are marked with small colored stripes. In this interactive activity, students read about the colored stripes on a resistor and interpret the placement of those colors to determine the value of fourband resistors. The first two stripes represent numeric values and the third stripe is a multiplier. The additional resistor s series termination resistor task is to absorb energy reflected by the load at the source, thereby dampening overshootundershoot. Without resistors we would be unable to build electrical circuits. A single resistor may be used, or a pair half bridge, or four resistors connected in a wheatstone bridge configuration. These workout bands are a great option for busy people wanting. If there is only one black band in the center, the resistor is called a zero ohm resistor. Three 3 band resistor resistance color code calculator. Turn the resistor so that the gold or silver stripe is at the right end of the resistor. For a thin film resistor, vacuum deposition method is used to include the resistive material onto the insulating substrate. Series resistor in data lines electrical engineering. As a main drawback youre limiting your data rate somewhat as youre putting more load on the transmitter which will reduce risefall times.
Orient the resistor so you can read the stripes properly. If the fourth stripe is silver, the nominal resistance should be within 10% of the actual value. Just have a look to the resistor color code chart below and see the calculations, how the resistance value is. The tolerance band on a resistor indicates the spread of possible values of any particular resistor, for example a resistor marked as 47k. Alliance rubber resistor strips are a simple, portable product that allows you to get a custom workout anywhere. Photocells the photocell used is of a type called a light dependent resistor, sometimes called an ldr. Usually, the colored band at one end is closer to that end than is the colored band at the other end. It control the forward current to the led to a safer limit and protect it from burning. Determine resistor value from its color code stripes have a resistor and not sure of the value. To calculate the resistance of a resistor, you can select the appropriate color bands in the above resistor color code calculator. Nonlatex resistance bands use the resistance from a large highquality rubber band and your own body weight to help you improve your strength, flexibility and body tone. Select the first 3 or 4 bands for 20%, 10% or 5% resistors and all 5 bands for precision 2% or less, 5band resistors. 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 the resistance value is a discrete value. The lefthand or the most significant coloured band is the band which is nearest to a connecting lead with the colour coded bands being read from lefttoright as follows.
How to read the resistor code first find the tolerance band, it will typically be gold 5%. Resistor and capacitor color code charts, march 1955. Online electrical calculator to determine the resistance of three band resistors. Highpower resistors that can dissipate many watts of electrical power as heat, may be used as. 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. Reading the resistor from left to right, the first two color bands represent significant digits, the third band represents the decimal multiplier, and the fourth band represents the tolerance. The wattage rating indicates the amount of power the resistor can safely dissipate as heat. Starting at the stripe nearest one end of the resistor, the first stripe gives the first digit. Cases are usually brown, blue, or green, though other colors are occasionally found like dark red or dark gray. Use the resistor color code chart below to understand how to use the color code system. The resistor pattern is connected to two terminals that are also deposited on the substrate as well as around the edges of the substrate in order to form surface mount terminals, typically one on each end of the device, or in mul tiple stripes along the long sides of the device in the case of a resistor network. With that knowledge, realize that on a fourband resistor the third color will always be blue 106 or less and on a fiveband resistor, the fourth color will always be green 105 or.