Decode resistor, capacitor, inductors color code

DECODE RESISTOR COLOR CODE

​Resistors restrict the flow of electric current, for example a resistor is placed in series with a light-emitting diode (LED) to limit the current passing through the LED.

Decoding Resistor Color Cod

​Connecting and soldering

Resistors may be connected either way round because they are not polarized (no negative or positive). They are not damaged by heat when soldering.

Resistor values – the resistor colour code

Resistance is measured in ohms, the symbol for ohm is an omega . 1 is quite small so resistor values are often given in k and M .
1 k = 1000 1 M = 1000000 .

​Resistor values are normally shown using coloured bands. Each colour represents a number as shown in the table. Most resistors have 4 bands:

​The first band gives the first digit. The second band gives the second digit. The third band indicates the number of zeros. The fourth band is used to shows the tolerance (precision) of the resistor. (Gold is 5%, Silver is 10% and None is 20%)

​This resistor has red (2), violet (7), yellow (4 zeros) and gold bands. So its value is 270000 ± 5%= 270 k ± 5%. On circuit diagrams the is usually omitted and the value is written 270K.

​Example of Resistor Colour Coding

​The band colours for the resistor colour code in the order: Band colours in order RED ORANGE ORANGE GOLD Using the table the digit representation is as 2 2 3 with multiplier 103 and the tolerance ±5% Thus, the value of the resistance is, 23×103 Ω ± 5 % i.e. the value of the resistance is, 23000 Ω ± 5 % The value of the given resistance is: 23000 Ω ± 5 %. The tolerance of the resistor can be calculated as follows:

​Tolerance = Value of Resistor × Value of Tolerance Band
= 23000 Ω ⨯ 5 % = 1150 Ω This means that the 23000 Ω resistor with a tolerance value of 1150 Ω could range from the actual value as much as 24150 Ω to as little as 22850 Ω.

​Mnemonic of Resistor Colour Code
Learning the Resistor Colour Coding is very important and the mnemonic used to find the value of the resistor is,

BB ROY of Great Britain had a Very Good Wife

The capital letters represent the first letters of the colours and their positions in the digit values. The representation of the colour code as, Black, Brown, Red, Orange, Yellow, Green, Blue, Violet, Grey, and White

​Example 1: Find the resistance of the resistor

​Solution:
The band colours for resistor colour code in the order:

​Band colours in order RED RED ORANGE SILVER
using the table the digit representation is as, 2 2 3 and the tolerance is ±10% Thus, the value of the resistance is, 22×103 Ω ± 10 %
i.e. the value of the resistance is, 22000 Ω ± 10 %
The value of the given resistance is:
22000 Ω ± 10 %. The tolerance of the resistor can be calculated as follows: Tolerance = Value of Resistor × Value of Tolerance Band
= 22000 Ω ⨯ 10 % = 2200 Ω
This means that the 22000 Ω resistor with a tolerance value of 2200 Ω could range from the actual value as much as 19800 Ω to as little as 24200 Ω.

Multiple Choice

What is the purpose of the resistor color code?

• To indicate the temperature rating of the resistor

• To denote the resistance value of the resistor

• To signify the power rating of the resistor

• To specify the tolerance level of the resistor

Multiple Choice

What is the unit used to measure resistance?

• Ampere

• Ohm

• Volt

• Watt

Multiple Choice

What does 1 k represent in resistor values?

• 1

• 10

• 100

• 1000

Multiple Choice

How are resistor values commonly shown?

• In letters

• In numbers only

• Using colored bands

• Using dots

Multiple Choice

Which band of a resistor indicates the number of zeros in its value?

• First band

• Second band

• Third band

• Fourth band

Multiple Choice

What does the gold band represent in the resistor color code?

• 5%

• 1%

• 10%

• 20%

Multiple Choice

What does the mnemonic "BB ROY of Great Britain had a Very Good Wife" represent?

• The colors of the rainbow

• The colors of the resistor bands

• A historical event

• A famous person's name

Multiple Choice

According to the resistor color code, what does the color red represent?

• 2

• 5

• 7

• 9

Multiple Choice

(Time for this is 1 minute)

If a resistor has a value of 47000 Ω with a tolerance of ±10%, what could be the range of its actual value?

• 42300 Ω to 51700 Ω

• 4230 Ω to 5170 Ω

• 42300 Ω to 5170 Ω

• 4230 Ω to 51700 Ω

Multiple Choice

(Time for this is 1 minute)

How would you interpret the colors brown, green, black, and gold in the resistor color code?

• 15 ohms with 5% tolerance

• 15 kilohms with 10% tolerance

• 15 ohms with 10% tolerance

• 15 kilohms with 5% tolerance