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Resistor

A resistor is an electrical component that resists the flow of current in a circuit.
Resistance is measured in ohms (Ω).

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

The value of a resistor is identified by the color coding. Colored bands are painted on
the resistor, and each color represents a number which define the resistor value.

Resistor Color Code

Resistors often have coloured bands to indicate their resistance value, multiplier, and tolerance.
Here’s a breakdown of the process:

Color coding table

Example: How to calculate resistor value?

Step 1 Look at the resistor and refer to the table and note down the
color band numbers.
Step 2 For the first band, if it’s red, write down the number 2. Repeat
this for the second band.

Step 3 Write down the numbers from the first and second bands together, like 22 (as shown in the
image).

Step 4 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 5 Add the unit of resistance, ohms (Ω), after 22000.

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