Comment on the effect of different size capacitors as regards regulation.?
Answer:
I assume that you ask about the effects of different sizes of capacitors on power supply filtering (not regulation) -- e.g., a single capacitor on the back side of an AC to DC rectifier bridge. I'll further assume that you don't so much mean physical size, but rather, the value (in some fraction of Farads -- like microfarads) of the capacitor -- although with everything else being equal, larger capacitance creates a physically larger capacitor.
The selection of the appropriate capacitor size has to do with the load being put on the supply. The load, looked at as a resistor, combines with the capacitor to create an RC filter circuit. The larger the load, the more quickly it can discharge the capacitor, so the larger the capacitor must be (measured in some fractional amount of Farads) in order to create a good filtering effect.
As the capacitor is decreased in from its optimal value, based upon the load on the supply, the higher the amount of ripple voltage you'll see on the output.
That's all a good bit of oversimplification, but gets to the point. When you start to create pi filters (two capacitors and a resistor), you need to pay a bit more attention to specific capacitor values.
Regulation of what?
Capacitors can be used to improve the power factor of an electrical circuit.
Having a good power factor improves the regulation.
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