Re: very simplistic potentiometer question

One other thing to add to all the good information, above.

This table is just a "rule of thumb". You need to read the data***
for each LED for the exact current ratings and voltage drops.

RED -- 1.5 V 10 to 20 mA (some as low as 1 mA)
AMBER -- 2.0 V 10 to 20 mA
GREEN -- 2.2 V 10 to 20 mA and even higher
For the following colors it is best to read the data***
BLUE -- 3.5 V to 5V(on some) 20 to 50 mA and higher
WHITE -- same as blue

Note that some of the BLUE LEDs have very low reverse voltages, and can
be damaged by connecting them backwards to the 9V battery.

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