is it possible to run 5mm white(3.3v each) 6 led series by 5v adapter without any rasister????
You should use some resistors.
The math for calculating what size resistors is pretty easy. Also pages like this,
can do the math for you. If you know how much current you want to flow through the LEDs, then use that number. Otherwise, I suggest 20 milliamperes (20 mA) as a typical, safe but still bright, amount of current for a 5 mm size LED.
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(diode forward voltage) how di i khow
You say in your question, 3.3 V !
You don't need another topic for this as you already got the answer in your previous one ;)
i didn't know before my first question was answered i show it aftere post this question