![]() I still have an idea of how to see physical meaning. That is, this statement makes no physical sense.Īt the same time, the principle of superposition is formally valid… and this is the paradox… The load voltage V2 cannot create current I2 = V2/R1 since it is zero when V1 is zero. That is right, because the superposition principle assumes at least two sources… and here there is only one. If we replace the voltage source V2 with a resistor R2, we can continue to think the same way… but in the second case we will not be able to make physical sense of what is happening. That is, the current decreases since another opposing voltage is subtracted from the initial voltage.īut with the same success we can say that, according to the superposition principle, the current decreases since another opposing current I2 = V2/R is subtracted from the initial current I1 = V1/R. We can explain why in two ways - in terms of voltages and in terms of currents.įirst we can say that, according to KVL, the effective “current-creating” voltage VR = V1 - V2 across the resistor R decreases… аnd this decreases the current I = (V1 - V2)/R. Unfortunately, it is loaded by another voltage source V2 with lower voltage. At best, it would be short connected, and the current would be simply I = V1/R. ![]() Imagine a simple current source assembled by a voltage source V1 and resistor R. ![]() Let me explain what this is all about with a simple example. ![]() I came across this problem for the first time when I started thinking about the clever circuit of Howland current source (see What is the brilliant idea behind the Howland current source?). ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |