- I understand that an inductor cannot change current instantaneously, however I am not sure how that relates to the voltage. In a high pass RL circuit, for example, I know that the inductor presents a high impedance to high frequency signals. However isn't this impedance only defined with the frequency of current through the inductor, and not the frequency of voltage? So do these RL circuits filter currents, and also filters voltages as a result of filtering currents?
When one says that an inductor has a "high impedance to high frequency signals", is this referring to both current and voltage, because both have the same frequency? Also, how does the EMF generated by the inductor to prevent sudden changes in current affect the output voltage of a filter? Does this have an effect on the filtering of the voltage with an RL circuit?
I tried to think of an RL circuit as a voltage divider with the inductor having an equivalent impedance at a certain frequency, however I am confused because I thought the impedance is only defined with the current frequency.
- Secondly, I know that a capacitor stores energy as an electric field, as accumulated charge on one plate and the same magnitude of the opposite charge on the opposite plate. I also know that a capacitor presents a lower impedance to high frequency voltage, because with a high enough frequency the capacitor does not have time to charge up and accumulate an electric field in either direction, since the direction is always changing fast. Doesn't this depend on the size of the capacitor? Or is this only the case if a resistor is in series with it, because the time constant is RC? Also, what is the direction of voltage across a capacitor does not change direction quick, rather there is a voltage spike in the same direction as the DC voltage? We can't use the same analogy for constantly changing voltage direction right? How does a capacitor in this case supply current to "suppress"
If someone could provide an intuition on the voltage and current behaviors of inductors and capacitors, that would be greatly appreciated. I guess I have always been thinking of inductors and their relation to current, and capacitors with their relation to voltage, however not the other way around, and it is hard to find good intuition online because most websites associate inductors with current and caps with voltage. I have been trying to connect the dots on my own, however it has not been helping much. Thanks!