Correct option is A
A Silicon Controlled Switch (SCS) is a type of thyristor, a four-layer semiconductor device used for switching and controlling electrical power. The SCS is similar to a Silicon Controlled Rectifier (SCR) but with an additional gate terminal for turning off the device, making it more versatile for certain applications.
Structure and Operation
An SCS consists of four layers of alternating P and N-type material (PNPN), forming three PN junctions. It has four terminals:
1. Anode (A): The main terminal for current flow.
2. Cathode (K): The terminal where the current exits.
3. Gate (G1): The terminal used to turn on the SCS.
4. Anode Gate (G2): The terminal used to turn off the SCS.
