My values: source V = 9 , LED forward voltage = 4 (white), LED amps = 30 mA, 2 LEDs
I understand ohms law and using that I would need a 33 ohm resistor. When I input the specs. into the LED array wizard, I get this: Solution 0: 2 x 1 array uses 2 LEDs exactly
R = 39 ohms The wizard says: In solution 0: each 39 ohm resistor dissipates 35.1 mW the wizard thinks 1/4W resistors are fine for your application together, all resistors dissipate 35.1 mW together, the diodes dissipate 240 mW total power dissipated by the array is 275.1 mW the array draws current of 30 mA from the source.
SO.......when I run the circuit my meter reads .054 amps in the circuit. I am using a 39 ohm resistor. Why is the amperage so much higher? I checked the source and it is a stable 9V. its weird....any thoughts?