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Thyristor can only be turned on by small gate pulse but it cannot be turn off by using gate hence thyristor is called semi controlled device.
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In  BJT  there  is  movement  of   electrons  and  holes   accros  the  junctions  which  is  basicaly  current  flow.

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Why SCR is called as thyristor?

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Why thyristor are not preferred for inverter?

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parallel operation of MOSFET can be done more easily as compared to thyristor. why?

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