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It is used to control the amount of current that flows through an LED to prevent it from
burning out.

Resistors have a resistance value measured in ohms (Ω) that determines how much
current they allow to pass through them.
The value of a resistor is identified by the color coding. Colored bands are painted on
the resistor, and each color represents a number. By reading the colors in a specific
order, students can determine the resistor’s value.

We need to refer to the color-coding table to determine the resistor value.

Color coding table

Example: How to calculate resistor value?
Step 1 Look closely at the resistor to see the color bands.

Step 2 Refer to the table and note down the color band numbers.

Step 3 For the first band, if it’s red, write down the number 2.
Repeat this for the second band.

Step 4 Write down the numbers from the first and second bands together, like 22 (as shown in the
image).
Step 5 The third band’s color is orange, which acts as a multiplier. Look at the table to find that
orange represents 10^3. Multiply 22 by 10^3 to get 22000.

Step 6 Add the unit of resistance, ohms (Ω), after 22000.

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