by 
Eldiar
ANSWERS: 2
-
The AC impedance of a capacitor is called capacitive reactance. It decreases with increasing frequency. While Ohm's Law applies directly to resistors in DC or in AC circuits, the form of the current-voltage relationship in AC circuits in general is modified to the form: where I and V are the rms or "effective" values. The quantity Z is called impedance. For a pure resistor, Z = R. Because the phase affects the impedance and because the contributions of capacitors and inductors differ in phase from resistive components by 90 degrees, a process like vector addition (phasors) is used to develop expressions for impedance. More general is the complex impedance method.
-
5-29-2017 It takes a few weeks to explain the basic concepts, and then it only takes one sentence to answer your question. Here is a free course in the basics: http://www.phy.davidson.edu/instrumentation/NEETS.htm The answer is there is no dc current path through the capacitor. But you have to understand what impedance is for that to mean anything.
Jewels Vern RELATED QUESTIONS
Copyright 2023, Wired Ivy, LLC