- 1 What are the color bands on the resistor and what is their purpose?
- 2 What do the Coloured bands on a resistor mean?
- 3 How many Coloured bands are on resistors?
- 4 Why do some resistors have 5 bands?
- 5 What is the tolerance of 3 band resistor?
- 6 What resistor do I need for LED?
- 7 How do you calculate color code resistance?
What are the color bands on the resistor and what is their purpose?
Resistor Color Coding uses colored bands to quickly identify a resistors resistive value and its percentage of tolerance with the physical size of the resistor indicating its wattage rating.
What do the Coloured bands on a resistor mean?
The colour code used to denote the tolerance rating of a resistor is given as: Brown = 1%, Red = 2%, Gold = 5%, Silver = 10 % If resistor has no fourth tolerance band then the default tolerance would be at 20%.
How many Coloured bands are on resistors?
There can be anywhere from three to six colored bands on the body of a resistor, with four bands being the most common variation. The first few bands always represent digits in the value of resistance.
Why do some resistors have 5 bands?
The 5th color band on the right side represent the tolerance of the resistor and the 6th color band represents the TCR (Temperature Co-efficient of Resistance). The 1st color band indicates the 1st significant value of the resistors value. The 2nd color band indicates the 2nd significant value of the resistors value.
What is the tolerance of 3 band resistor?
As the 3-band resistor has no fourth tolerance band, the default tolerance is taken to be at 20%.
What resistor do I need for LED?
LEDs typically require 10 to 20mA, the datasheet for the LED will detail this along with the forward voltage drop. For example an ultra bright blue LED with a 9V battery has a forward voltage of 3.2V and typical current of 20mA. So the resistor needs to be 290 ohms or as close as is available.
How do you calculate color code resistance?
Reading and Determining the Resistor Value Hold the resistor with the gold or silver band to the right and read the color codes from the left to the right. Select the color codes from the bands on the resistor. Read the colors from left to right. The resistance value based on the color code provided is now displayed.