Above is a dimmer circuit. In some of these circuits I see a toroid inductor together with a capacitor forming a low pass LC filter which is called choke filter.
My questions are:
Why is RL used instead of RC and is that something to do with the character of mains freq. and voltage? Inductors are expensive or big thats why we use caps around opamps to obtain low pass filters right?
What is being choked by the LC toroid cap couple?