In my attempt to understand this simple law, I had limit my vision to just Volt, Resistance and Ohm.
But thanks to your suggestion Ian Rogers, I have attempted to bring "watt" into the equation and now everything is "starting" to make sense to me.
It feels good that everything is united, that they are not their own separate theories.
I am thinking aloud here, Say we have 6 Volts, Red LED Forward Voltage: 2 Forward Current 0.02Amp.
(6-2)/0.02 = 200Ω
Current = Voltage/Resistance :: Hence Current = 0.03 Amp
(What exactly is this 0.03 now ? is this the amount of current used by the LED in Total ? Or the Amp taken by the entire circuit ? I don't think this is the case as we are just dividing it by one of the component's resistance in the circuit, LED itself have some resistance in which this calculation has not taken it into account.)
W = V x A :: Hence Watt = 0.18 Watt.
W = V² / Ω :: Hence Watt = 0.18 Watt.
W = A² * Ω :: Hence Watt = 0.18 Watt.
So beautiful...the equations are connected, Watt, Resistance, Current, Voltage...all related...so beautiful...no strays...
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I think I am really starting to understand here...
audioguru said:
If you connect a zillion 9V batteries in parallel then the available current is increased if you have a load that will draw that much current.
All this thinking is starting to make this sentence makes sense....you are saying that the circuit will only draw the amount of current that it "needs" to and no more.
So if I were to connect a Device that needed 6V whos own internal overall resistance is say 200Ω which would mean the device itself needs only 0.02Amp.
EVEN if I were to connect this "device" to a power supply of 6 Volt with a ZILLION Amps, everything is still going to be ok ?
Simply because of the charity behavior that the device will only take what it wants and the power supply will not kill it with an over current ?
By this measure one could not, theoretically, "destroy" a device by giving it an overpowering amount of current, because the device will only "take when it needs" WHEN it comes to current right ? (Voltage is another matter, over-voltage WILL kill a device because that is how CMOS chips get destroyed.)
Now if this logic is true...how is it that Human beings could be zapped to death by putting his finger in the main ? People say it's because of the Current but if the "device", in this case the Human body, will "Only take what it needs", there could theoretically be no case where it will take "more than what it needs" hereby killing the Human body no ?
But we do KNOW it will kill us...so what's going on here ?
This Result (death) seems to imply that a device just "take it all in", instead of the "The device just takes what it needs, the main's huge Amps is there and is good for supplying it if the device require it" charity theory.