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In this case, the resistance value would remain the same, except that the tolerance would be ☒0% as if it were a 3-band resistor. Sometimes for a 4 band resistor color code, the tolerance band can be left blank, resulting in a 3-band resistor. Lastly, the tolerance band which we identified to be gold gives a tolerance value of ±5%. The resistance obtained is 12 × 10 5 = 1,200 kΩ. The 3 rd band is green which means that the multiplier is 10 5. The second band is red and has a second significant digit of 2. Starting from the other end, the first band is thus identified to be brown which has a 1 st significant digit of 1. In this example, it is gold and thus gives a tolerance of ±5% when we look up the resistor color code chart. The tolerance band is also easily identified due to the increased gap between the tolerance band and the multiplier band. Calculating Resistor Color Codes 3 Band Resistor Color Codeįor a 3-band resistor color codes, the first two bands always denote the first two digits of the resistance value while the third band represents the multiplier.įor a 4 band resistor color code, we can begin by first finding the tolerance band as it is usually gold or silver. Sometimes this might be the only way to figure out the resistance, especially when the color bands are scratched or burnt off. If none of the ways above are helpful, you can always rely on a multimeter to measure the resistance. So, they belong to the right side of the resistor and again, read the resistor from left to right.Īlso, be sure to check your manufacturer’s documentation to be sure about the resistor color codes used. If you find a gold or silver color band on your resistor, it is definitely the tolerance band and the last band on the resistor.But this may not be the case all the time. The first band is usually always closest to the end.Put the larger group on the left and read the resistor from left to right. The bands are not regularly spaced apart and can be seen as being grouped into two. The most obvious trick to this is that there is an increased space that occurs before the tolerance band.
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#1054 CAPACITOR CODE CHART HOW TO#
More details on how to use it when we explore examples in the later section! You will find yourself referring to this chart frequently, as values needed to calculate the resistance value are compiled on this chart. Similar to how the periodic table is indispensable to a chemist, the Resistor Color Code Chart is your best friend when it comes to decoding a resistor’s code. Getting Started: Resistor Color Code Chartīefore getting to the math bit, you have to know about an important tool known as the Resistor Color Code Chart. Reading resistor color codes can become easy once you understand the math behind each colored band. We have put together a simple guide to explain the calculation behind resistor color codes. The colored bands are used to denote the resistance, tolerance and the temperature coefficient. Resistors can have 3 bands, 4 bands, 5 bands or 6 bands. Thus, instead of directly printing numbers onto the resistor, resistor color codes are used. Did you buy a pack of 500 resistors, only to be mortified to discover how clueless you are about those colorful rings on your new resistors? You wonder, why couldn’t they just print the resistance value on the resistor and make life easier for everyone? If reading resistor color codes sounds foreign to you, then read on! Can you tell which one is the 4.7 kΩ resistor?Īs resistors are small, it is pretty difficult to print numbers or the resistance value onto the small surface area of the resistor.