LEDs
eddiea6987:
If my power source can only source 200ma and i hook up 10 LEDs each operating at , just for argument sake , 100mA , then I will not light more then 2 right?
You're taking a very simple concept and adding a non-simple device (LED). Which is probably part of your confusion.
When LEDs have enough voltage dropped across them (forward voltage), they turn into a short circuit. So LEDs don't "take 100mA" or any current for that matter.
Resistors are linear devices. When a given voltage is dropped across them, a circuit amount of current will flow through them. LEDs are not linear in this sense.
Instead, how much current flows in a circuit with a 100ohm, 200ohm, and 300ohm resistor in series? How much current flows through each resistor...