Did you purchase a percent of 500 resistors, best to be mortified to find out how clueless you’re approximately the ones colourful earrings to your new resistors? You wonder, why couldn’t they simply print the resistance fee at the resistor and make lifestyles less difficult for everyone? If analyzing Resistor Color code sounds overseas to you, then study on!
Can you inform which one is the 4.7 kΩ resistor?
As resistors are small, it’s far quite hard to print numbers or the resistance fee onto the small floor region of the resistor. Thus, rather than without delay printing numbers onto the resistor, resistor Color codes are used. Resistors will have three bands, four bands, five bands or 6 bands. The coloured bands are used to indicate the resistance, tolerance and the temperature coefficient.
We have prepare a easy manual to give an explanation for the calculation at the back of resistor Color codes. Reading resistor Color codes can grow to be smooth after you apprehend the mathsematics at the back of every coloured band.
Getting Started: Resistor Color Code Chart
Before attending to the mathsematics bit, you need to understand approximately an essential device called the Resistor Color Code Chart. Similar to how the periodic desk is necessary to a chemist, the Resistor Color Code Chart is your nice buddy in relation to deciphering a resistor’s code. You will discover your self relating to this chart frequently, as values had to calculate the resistance fee are compiled in this chart. More info on the way to use it whilst we discover examples withinside the later phase!
Is there an smooth manner to bear in mind those colorations?
Absolutely. If you discover it hard to bear in mind what colorations there are in resistor Color codes, attempt those mnemonics.
Acronym: BBROYGBVGW
Phrase: Bad Beer Rots Our Young Guts But Vodka Goes Well
B.B. Roy of Great Britain has a Very Good Wife
Bad Boys Race Our Young Girls But Violet Generally Wins
Getting Started: Identifying the primary coloured band
This is the query that typically arises first due to the fact we will’t begin calculating the resistance from the resistor Color code if we will’t get their analyzing route proper withinside the first area. Fortunately, the resistor Color code has a few visible clues that deliver the solution away!
The maximum apparent trick to that is that there’s an improved area that takes place earlier than the tolerance band. The bands aren’t frequently spaced aside and may be visible as being grouped into . Put the bigger institution at the left and study the resistor from left to proper.
The first band is typically continually closest to the end. But this will now no longer be the case all of the time.
If you discover a gold or silver Color band to your resistor, it’s far in reality the tolerance band and the remaining band at the resistor. So, they belong to the proper facet of the resistor and again, study the resistor from left to proper.
Also, make sure to test your manufacturer’s documentation to make sure approximately the resistor Color codes used. If not one of the methods above are helpful, you could continually rely upon a multimeter to degree the resistance. Sometimes this is probably the best manner to parent out the resistance, specially whilst the Color bands are scratched or burnt off.
Calculating Resistor Color Codes
three Band Resistor Color Code
For a three-band resistor Color codes, the primary bands continually denote the primary digits of the resistance fee whilst the 1/3 band represents the multiplier.
AB × C ± 20 × 101 ± 20% = a hundred Ω ± 20�nds:
A: 1st band – 1st tremendous digit
B: second band – second tremendous digit
C: third band – multiplier
In the instance we have, the bands are brown, black and brown. The first band is the brown band closest to the edge. We appearance up our resistor Color code chart, and discover that brown has the first tremendous fee of one and black has the second one tremendous fee of 0. The 1/3 band is brown, this means that that the multiplier is 1. Using the formula, the resistance is as a result calculated to be:
As the three-band resistor has no fourth tolerance band, the default tolerance is taken to be at 20%.
four Band Resistor Color Code
The four-band resistor Color code is the maximum generally used resistor. Similar to the three band resistor, the primary bands continually deliver the primary 2 digits of the resistance fee. The 1/3 band represents the multiplier whilst the fourth band represents tolerance.
AB × C ± D × 105 ±five% = 1,two hundred kΩ ± five�nds:
A: 1st band – 1st tremendous digit
B: second band – second tremendous digit
C: third band – multiplier
D: 4th band – tolerance
For a four band resistor Color code, we will start through first locating the tolerance band as it is also gold or silver. The tolerance band is likewise without difficulty diagnosed because of the improved hole among the tolerance band and the multiplier band. In this example, it’s far gold and as a result offers a tolerance of ±five% whilst we appearance up the resistor Color code chart. Starting from the alternative end, the primary band is as a result diagnosed to be brown which has a 1st tremendous digit of one. The 2nd band is pink and has a 2nd tremendous digit of 2. The third band is inexperienced this means that that the multiplier is 105. Using the formula. The resistance received is 12 × 105 = 1,two hundred kΩ. Lastly, the tolerance band which we diagnosed to be gold offers a tolerance fee of ±five%.
Sometimes for a four band resistor Color code, the tolerance band may be left blank, ensuing in a three-band resistor. In this case, the resistance fee could continue to be the identical, besides that the tolerance could be ±20% as though it have been a three-band resistor.
five Band Resistor Color Code
five band resistors are resistors with better precision, and that they have a further band for a third tremendous digit. As such, the primary 3 bands denote the tremendous digits of the resistance and the whole lot else shifts to the proper, making the fourth band the multiplier and the 5th band the tolerance.
ABC × D ± EG5 × a hundred ± 1% = 475 Ω ± 1�nds:
A: 1st band – 1st tremendous digit
B: second band – second tremendous digit
C: third band – third tremendous digit
D: 4th band – multiplier
E: fifth band – tolerance
In this example, the tolerance band is brown and is diagnosed through the improved area among itself and the multiplier band. From the resistance Color code chart, we gain a tolerance fee of ±1% for brown. Beginning from the alternative end, the primary band and 2nd band is yellow and violet, which offers the first and second tremendous digit of four and seven respectively. The greater 1/3 band is blue and so the third tremendous digit is five. The fourth band is black and offers the multiplier fee of a hundred. Using the formula, we get the resistance fee of 475 × a hundred = 475 Ω.
6 Band Resistor Color Code
A 6 band resistor is basically a five band resistor with a further ring that denotes the temperature coefficient or sometimes, the failure rate. The maximum not unusualplace Color for the 6th band is brown (a hundred ppm/K), this means that that for each 10℃ alternate in temperature, the resistance fee modifications through 0.1%.
ABC × D ± E%, F
274 × a hundred ± 2%, 250 ppm/K = 274 Ω ± 2%, 250 ppm/K
Bands:
A: 1st band – 1st tremendous digit
B: second band – second tremendous digit
C: third band – third tremendous digit
D: 4th band – multiplier
E: fifth band – tolerance
F: sixth band – temperature coefficient
For this example, the Resistor Color Code bands may be grouped into 2 corporations in step with the gap among the multiplier band and the tolerance band. Place the bigger institution at the left and the smaller institution at the proper and study the resistor from left to proper. Again, we take a look at the resistor Color code chart for pink, violet and yellow, and the primary, 2nd and 1/3 bands deliver the tremendous digits of 2,7 and four respectively. The fourth band is black, giving a multiplier fee of a hundred. Hence, we can get a resistance fee of 274 × a hundred = 274Ω. The 5th tolerance band offers a tolerance fee of ±2%. The 6th band is black and offers a temperature coefficient fee of 250 ppm/K.
Resistor Color Band Exceptions
Zero-Ohm Resistors
Zero-ohm resistors are resistors that may be without difficulty identified through their unmarried black band. Basically, it’s far a cord hyperlink with the best characteristic of connecting strains on a broadcast circuit board. But why now no longer use a everyday jumper cord for that purpose?
Zero-ohm resistors are diagnosed through their unmarried black band
(Source: ES Mobile)
The purpose at the back of why they may be normal to appear like resistors is due to the fact additives in maximum revealed circuit forums are located the use of computerized insertion machines rather than being manually located through hand. By searching like a resistor, producers can employ the identical computerized gadget to area for putting additives on a circuit board. This removes the want for a separate gadget for putting in jumper wires.
In addition, zero-ohm resistors may be greater without difficulty eliminated than jumper wires. This permits any layout modifications to be without difficulty made if necessary. The zero-ohm resistor may be without difficulty eliminated and changed through new additives.
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That’s interested by our manual on resistor Color codes! If you’ve got got any in addition questions or pointers approximately the way to use the resistor Color codes to calculate resistance, sense loose to drop us a message withinside the feedback phase below.
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