Made several PCBs (digitally) and now looking at what power I'll need to
power them. Pretty simple boards, bunch of LEDs, resistors for those LEDs,
relays, and switches. As I said, pretty simple. :-) I need to decide on
voltage as well as the amperage requirement. This is my first project I've
done entirely by myself so just looking for ideas. Do I need to add up the
amperage requirement for each LED? (.020mA) and then the requirement for
each Relay and then thats my requirement? Does this need to be done for the
voltage? If each LED is 2VDC and .020mA and I have 10 does that mean I need
20VDC at .200mA or just 2VDC at .200mA?

There is no amperage requirement for resistors, correct? Also the current
will be flowing through 100feet of cable, I'm assuming I need to figure in
resistance at that kind of length?

Thanks for any help!