![]() Unfortunately, much of the literature is confusing but it is much better now than in my early learning days.Ĭlick to expand.Of course, this is not at all true in the Real World: Only in the theoretical world can we lay claim to perfect batteries, capacitors, inductors, wires, etc. You need to understand electronics and understand mathematics to relate the two effectively. ![]() Thus di/dt= 1Īs you imply with your question, applying mathematics to electronics is quite difficult and is one of the great failings in electronics in general. Thus, if you apply 1V across an inductor of 1 Henry the current will increase at a rate of 1 Amp per second. (2) If you force a current through an inductor an infinite voltage will be generated.īut, in practice, if you apply a constant voltage to an inductor the current through the inductor will increase linearly for ever. Thus, if you force a constant current of one Amp into a capacitance of 1 Farad, the voltage across the capacitor will increase by 1V per second. (1) If you apply a voltage to a capacitor an infinite current will flow.īut, in practice, if you force a constant current into a capacitor the voltage across the capacitor will increase linearly for ever. A third, and more basic tenant, is that you cannot place a short circuit across a voltage source, because an infinite current will flow. The other is that you cannot force a current through an inductor because an infinite voltage will be generated. You can also connect a perfect constant current source to a capacitor or inductor as long as there is a resistor in parallel with the constant current source.Ĭlick to expand.I was being flippant vead because it is one of two related impossibilities in electronics. All REAL situations will have a component of resistance in the circuit so you can connect a perfect battery to a capacitor or inductor in series via a resistor. If you connected a perfect constant current source to an inductor the inital voltage would be infinity. Also you can connect an inductor to a constant voltage source (A perfect battery.) but again you must specify a time as the current will evenually reach infinity. Asking the question with an example of a capacitor connected to a constant current source would be valid provided you also specified a reasonable time that it was connected as the voltage would eventually reach infinity. The way you asked the question shows that you do not understand the way capacitors and inductors behave. This is **broken link removed** which should answer your question. If you Google " derivation of capacitor charging equation" you will get many hits.
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