Hi,

Pls bear with me, I am new to EE. I have couple of questions about lighting up LEDs. I understood amperage and LED goes hand in hand. Hence,

Q1. Does it mean voltage is not a concern at all. That is, 3V and 12V will give the same brightness assuming the ampere for both 3V and 12V is the same at 25ma ?

Q2. If my power source produces 12V at 1amp, do I calculate the resistor value based on this 1 amp (using Ohm's law) or I simply use say, 330R resistor ?

Q3. Say, my power source (transformer) besides driving a LED but, is also driving 2 x  0.17amp fans, does it mean I should first deduct the 0.34 amps from the 1 amp and use the balance to calculate the resistor value for the LED ?

Thanks in advance for the help.

best rgds,
Davis


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