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Resistor color code

Resistor color code chart with a brief explanation

A resistor is a general electronic component used in electronic circuits. It protects the circuits from over-current, maintains the limit of signals. It is a passive component of the integrated circuits. Resistor value expresses in resistance, and the unit is the ohm.

ohm Law,

We can calculate resistance through ohm law, which is expressed as:

I = V/R | V = IR | R = V/I

Current is directly proportional to voltage and inversely proportional to resistance. As the current increases, the voltage will increase, and resistance will decrease. We can calculate voltage and resistance values with this formula.

What is resistor color code, and why is it important?

To identify the value of the resistor, we can use two methods, by calculating ohm resistor value (resistor calculator) or by resistor color code (truth table).

A resistor calculator or a resistor color code table is used to understand the value of the resistor. We use these methods for normal-size resistors. At the capacitor, the code number is printed on it. There is a significant digit number code written on SMD-type resistors and capacitors.

For 1/2, 1/4, 1, 2, 3, 4-watt small resistor, it is not possible to write the number as of its shape & size. That's why color-banded resistors were manufactured in the 20th century.

But 5 watt or more wattage metal oxide film resistor contains written detail. Also, a high voltage resistor, that is used in printer and copier machines has written specifications on it.

What is the resistor color code calculator?

A resistor color code calculator is a software-based program. It is easy to use by selecting colors as per the first, second, and third columns. We use the fourth column for resistor tolerance.

How to read resistor color code chart?

The best way to read the color code is to learn the sequence of colors. In school days, most people learned quickly. There are two types of color code tables used to find the resistor value.

Resistor color code

We use the last digit for the resistor tolerance value. The Fifth-band color could be gold or silver.

If we have a four-band truth table, then the first two-band represents significant digits. We used the third band for the multiplier, and the fourth band is a tolerance band.

If we have a 5-band resistor color code table, then the first two-color represents significant digits. Third color for the multiplier. We use the fourth color for tolerance, and the fifth band represents temperature efficiency.

The resistor, which contains a single black band, is a zero-ohm resistor. Here we can understand from given below some examples:

1K resistor color code

Resistor color code

Brown = 1 first significant digit

Black = 0 second significant digit

Red = 2 multiplier(add zero equal to digit)

Golden = +5% tolerance

Total resistance = 1000 ohms = 1K ohms

If we want to understand the 1K ohm resistor, we can learn from this picture. The first color is brown represents 1, and the second is black, so add zero and the third is red. According to the table, red is equal to 2, so we have to add two "00" with this value. We get a 1k ohm resistance value.

10K resistor color code

Resistor color code

Brown = 1 first significant digit

Black = 0 second significant digit

orange = 3 multiplier(add zero equal to digit)

Golden = +5% toerance

Total resistance = 10000 ohms = 10 K ohms

If we want to understand the 10K ohm resistor, we can learn from this picture. The first color is brown represents 1 and the second is black so add zero and the third is orange. According to the table, orange is equal to 3, so we have to add three "000" to this value. we get a 10k ohm resistance value.

Difference between 4-band and 5-band resistor

The difference for 4-band or 5-band is a more precise resistor, one extra color used for temperature tolerance resistor value. 5 band resistors are more precise than 4 band resistors.

The failure rate is less than 4-band. Sometimes, we have a three-band resistor without 4th band. Then it will be a 20 % tolerance. Usually, we know the resistance value starts from 0.1 ohms to mega-ohms.

Standard Resistor Values

It is a system developed to prepare resistance tolerance values. The E-series resistor categories in different sets e.g. E3, E6, E12, E24, E48, E96, and E192 series.

The category shows the error percentage of the component. It is the tolerance of the resistor. In 1952, the E-series was produced in accordance with IEC 63. The E-Series is not only used for resistors only, but Also for electrolytic capacitors, inductors, diodes.

SMD resistor Code

SMD components are widely used in electronic circuits. For SMD resistors, a three-number code is used for resistor value. SMD resistor code chart is also available to find the value.

We do not use color codes for SMD resistors. Nowadays, SMD components are used in almost all circuits to reduce the space of the circuit.


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