Resistor Specifications

Using Ohm's law, which states that voltage = current/resistance, and using Kirchoff's voltage law, which states that the sum of all the voltages in a loop must equal zero, I was able to find the desired resistance I wanted.

I wanted to use the computers power supply 5 volt output to power all the LEDs, so....

5V - IR(Ohm's law) - 3(1.6V) = 0 (1.6V is the primary operating range of the LEDs)

+----|>|----|>|----|>|---/\/\/----+

So the resistance of the resistor must equal 2.2 ohms. Thus, I searched digikey.com for some 2.2 ohm resistors. Since each resistor dissipates about 22 mW, a 1/4W resistor should do the trick. I ended up getting the OD22GJE-ND resistors.

Click here for the resistor specs.