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Answer Posted / vilas
Thyrister is a silicon controlled rectifier,it has four
layers, it has a gate for firing circuit, applying a small
current pulse to the gate the scr can be fired,and power is
supplied to the d.c. motor,or load, scr is used for power
switching device, with the help of potentiometer, the gate
voltage is controlled, so as firing of scr can be contorlled
and thus power output (d.c. voltage) is controlled,thus it
is used as speed control device,
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