Originally Posted by
Robh3606
You can pass DC through a capacitor or a transformer?? What about the time constant to charge the cap?? Does it just go away when you apply an AC voltage??
you cut off the interesting part...
its just that AC is changing in time while DC isn't, so this complicates the circuit analysis, and takes it from simple arithmetic into the realm of calculus and differential equations when you add reactive signal elements like inductors, capacitors, transformers (and, of course, at a high enough frequency, *everything* has reactance)..