voltage / resistance = current. simple ohm's law.

E
I R

voltage / current = required resistance


"Bob Liesenfeld" wrote in message
...


bobinphx wrote:

To All, I need to understand a few things about LED's, such as amperage,
current limiting and light output.. Anyone an expert that can explain
things
and answer my further rising questions in terms an electronics hack
(myself)
can understand...

Thanks
Bob in phx...


Well, as a start it is generally assumed that an LED when under
forward bias and lit up has 2V across it with 20mA flowing through it.
This allows you to calculate a series resistor with any applied voltage.
Does this help? Any other questions?

Bob WB0POQ