Power Electronics
Power electronics essentially deals with control of a.c. power at ___________.

50 Hz frequency
Frequencies above 20 kHz
Frequencies above 1000 kHz
Frequencies less than 10 Hz

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Power Electronics
In forward blocking mode of a thyristor

  Junction J1 and J2 is in forward bias and J3 is in reverse bias.
  junction J2 is in reverse bias and J1, J3 is in forward bias.
  Junction J1, J3 is in reverse bias and J2 is in forward bias.
  junction J3 is in forward bias and J1, J2 is in reverse bias.

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