Calculate the resistor value using ohm's law, which states: voltage = current times resistance. The required voltage drop is four volts, as the battery provides nine volts and five volts is needed to power the LED. Putting the voltage drop and an example LED current of 20 milliamps into the equation gives: 4 = 0.02 x R.
A Better Answer. A resistor is not needed to drive an LED. What is needed is a means to limit the current that flows through the LED. Resistors offer an expedient means for limiting the current through an LED to safe levels, but they have two downsides: 1. Resistors are inefficient:

The 100 Ohm resistor is commonly used for LED protection. Best used with white, blue and green LEDs at 5V. 100 Ohm resistors can also be used with other colors but expect the brightness to differ

We’re using two resistors, R1 a 1K Ohm resistor (top) and R2 a 2.2K Ohm resistor (bottom) to create a voltage divider. The legs of R1 and R2 go into the same row of the breadboard. Into R1 we
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For typical green LEDs, that's usually about 2.1 V. Red LEDs are lower, and IR LEDs even lower still. Blue and white are higher, like a bit over 3 V. Let's say for sake of example you have a typical 20 mA green LED that drops 2.1 V. The battery puts out 9 V, so that leaves 9V - 2.1V = 6.9V accross the resistor in series with the LED.
I am using a 2.2v max V-F, and 35mA max I-F LED and want a simple "power on" indicator light from the 120 volt A/C line. Do I need a diode/resistor on both the anode and cathode of the LED? I tried a suggestion I read on this site that said a 27-47k resistor would work by it self, but it pops the resistor and LED instantly.
Step 3: Superior Parallel LED Wiring. Both of these use a nine volt battery, five white 3.6 forward voltage LEDs and circuits that draw (pull) the same current about 100 milliamps.. There is a tendency to use the single 54 ohm 1 watt resistor but that is a very poor design because of variable light intensity like the cube explained in the Step 2 – Calculating Your Power Rating. Next, you need to figure out how much power your resistor is going to need to dissipate. This can be calculated with the following formula: In this formula, P is your power in Watts, V is the voltage drop across the resistor, and R is the resistance of the resistor in Ohms. Decide the end you wish to work on - whether you want the light to shine UP or DOWN. Mark out 2 rows of 7 points, 3/8" apart on masking tape. Center it on the end you decided on and start 14 holes with a 1/16" bit. Expand, using a 3/64" bit. Smooth the holes SLIGHTLY - it should hold the LEDs snug.
Look at the Red LED, it has a V of 2V at I To drive from 5V, you need to waste 3V on the current limiting resistor with 20 mA of current flow. E = I * R so 3V = 0.020 * R or R = 3 / 0.020 = 150 Ohms. Any lower value will be overdriving the LED and it will probably work pretty well with a resistor twice as big, say 330 Ohms.

I just don't have time to get into this right now. I'd rather do the turn signals with my head lamp than the lift. The clock is ticking. Damn, I'm exhausted. I need to go back to work so I can get some rest. Thanks everybody. Wish me luck getting the Jeep back together before work tomorrow.

Originally Posted by cb_13. Hyper flash (which the bcm does to let you know there is a turn signal bulb out) can be turned off with IDS and most likely ForScan as well. That would eliminate the need for wiring in resistors.Most likely be a programming fee at the dealership. Where I'm at we'd charge $57.50 for it. One common example is to find the resistor value you need for an LED. Next, you need to consider the power that the resistor needs to dissipate. Power dissipation in a resistor can be calculated with the formula. where P is power in Watt, V is the voltage drop over the resistor and R is the resistance of the resistor in Ohm. Let us look at an Step Four: Select your Lighting Load. Usually, LED dimmer switches to have maximum capacities that work with the connected LED lights. However, you’ll need extra care selecting your LED lighting load to avoid damage. If a dimmer switch has a 400W maximum capacity, you can use light loads up to that point. mXGO.
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