29-03-2019, 07:45 PM
Formula is right, approximately.
You can represent a lossy capacitor as an ideal capacitor in series with a small resistance, or as an ideal capacitor in parallel with a high resistance. The formula will allow you to convert one to the other.
However, if you have a capacitor with a constant series resistance, then converting to an equivalent parallel resistance will give you a value which varies with frequency. And vice versa. So, except in special cases, it's not a particularly useful exercise.
You can represent a lossy capacitor as an ideal capacitor in series with a small resistance, or as an ideal capacitor in parallel with a high resistance. The formula will allow you to convert one to the other.
However, if you have a capacitor with a constant series resistance, then converting to an equivalent parallel resistance will give you a value which varies with frequency. And vice versa. So, except in special cases, it's not a particularly useful exercise.
