Thyristors are semiconductor devices that are used as switches to control higher-level voltages and current.

Unlike variable control, thyristors have two states: fully open or fully closed.

In your original post, answer the following:

• Discuss  the operation of different thyristors such as SCRs, Diacs, Triacs,  UJTs, etc., with an emphasis on the application of each in the field of  control systems.