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the amperage will depend on what's in your circuit. Any circuit will only draw the amps it needs, no more. if you use a current source set for 1A and a load resistor of 10ohm, there will be 10V across it as ohm's law dictates. Even if you want it to have 100V across it, that won't happen, because that would be more than 1A.I can set the voltage, but I can't adjust the amperage. If I add an amperage source in series it cuts the voltage.
LED is an exception to this isn't it?Any circuit will only draw the amps it needs, no more.
I think I might see your confusion. When driving multiple LED's, it is often desirable to use a constant current source so you do not need individual current limit resistors for each LED. A constant current source can be used to supply the desired current for each LED, let us say in this case 5 mA per LED. Refer to attached figure below, which I just threw together to illustrate what I mean, in fact this would be a good circuit for you to build on your app to see what I am talking about. This is not the best type of current source, but it is a good one in learning about constant current sources. If you build this circuit in your app, you will notice that as you switch in and out the LEDS, that the current remains near 6.5 mA, also note that collector voltage is changing, as this is a constant current, so ohms law dictates, that for current to remain constant, then voltage must be changing.LED is an exception to this isn't it?
It's not an exception to the rule but it could arguably be an exception to the way I worded the rule. I said "Any circuit will only draw the amps it needs, no more."LED is an exception to this isn't it?
So the perfect voltage source will always supply however much current the circuit demands, up to infinity (direct short ), whether that is how much current you to flow or not (like as in "ah crap, I didn't want 1000A flowing thru my LED. I forgot the resistor.")