Can anyone tell me why are Thyristors(SCRs) used in power electronic circuits? How are they more adept at handling power as opposed to other active or passive electronic components?
UPDATE: As per the request made by jippie i am uploading the circuit diagram for a simple full wave rectifier to add a context.
(source: circuitstoday.com)
why should some one use SCRs in this circuit when the same action can be achieved using diodes?
Answer
Using Silicon Controlled Rectifiers it becomes very easy to control the output voltage by changing the phase angle for firing the SCR's. With the phase angle the average voltage and power can be controlled without dissipating energy in series resistors. Before SCR's became common, huge series resistors were used to control output power.
Using diodes does not allow for controlling the output voltage.
Image found on Wikipedia
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