## How do you decide the value of a resistor?

Table of Contents

To select a resistor for a specific application, the following steps are recommended:

1. 1 . (a) Determine the Resistance.
2. 2 . Determine the proper “Watt Size” (physical size) as controlled by.
3. 3 .
4. step 1 deteRmiNe ResistANce ANd wAtts.
5. step 2 poweR RAtiNg oR physicAl size oF ResistoR.
6. Ambient Temperature.
7. Enclosure.
8. Grouping.

What resistor do I need for RGB LED?

Resistor values are typically around 100-330 ohms. The three LEDs inside a single RGB LED often have different operating voltages and current levels, so check the datasheet. A red LED typically needs about 2 volts. The voltage drop tends to rise as the frequency of the light wave increases.

Do I need a resistor per LED?

For individual single LEDs, a resistor for each is simple and always works. Some LED driver ICs do away with the need for that by having constant current driver outputs, so no resistor is needed there.

### What size resistor do I need for LED indicators?

You should go with the 6 ohm resistor. A 25 ohm resistor can be used as well but it might burn your lamps.

Are all LEDs 3 volts?

Typically, the forward voltage of an LED is between 1.8 and 3.3 volts. It varies by the color of the LED. A red LED typically drops around 1.7 to 2.0 volts, but since both voltage drop and light frequency increase with band gap, a blue LED may drop around 3 to 3.3 volts.

What voltage is required for LED?

between approximately 1.2 to 3.6 volts
Most common LED’s require a forward operating voltage of between approximately 1.2 to 3.6 volts with a forward current rating of about 10 to 30 mA, with 12 to 20 mA being the most common range.

#### What resistor do I need for 12V LED turn signals?

6 OHM
You will need 50W 6 OHM load resistors and tap the load resistor to the stock harness in parallel. Load resistors also have no negative or positive, making it easier for you because you wouldn’t have to worry about which wires goes to which side.

How many volts is an RGB LED?

The datasheet for the RGB Common Cathode LED shows that the forward voltage is 2.0 volts for the Red segment, 3.0 volts for the Green segment and 3.0 volts for the Blue segment.