Answer Posted / vijay singh bisht

simple answer
capacitors are used in pcb ckts that work on dc for ample
of reasons. some of these are
1- filtering ac to get dc waveform(due to the fact that
cap. charging and discharging rates are different)
2- most imp. cap. produce energy bursts that is required
in some apps.
3- cap. is used for charge pumping in most of apps
4- cap. sometimes is used along with a resistor as a
SNUBBER ckt(to protect our imp components from sudden
voltage spikes)

simple expt to show second point.....
requirements..
a battery(9v), two switches, one led
connect bat. to cap via switch one and led to switch 2
(both in parallel to cap.
close sw1 and open sw2( ie cap is charging) after 3-5 mins
when cap is charged to some value open sw1 anddd nowww
close sw2...
what do u see??????
led glows for a while and then turns offf
conclusion- cap produce energy bursts

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