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A silicon controlled rectifier (SCR) is a
Unijunction device.
Device with 3 junctions.
Device with 4 junctions.
None of the above?
Most Upvoted Answer
A silicon controlled rectifier (SCR) is aUnijunction device.Device wit...


SCR (Silicon Controlled Rectifier)

An SCR is a solid-state semiconductor device that is used for controlling electric current. Let's discuss the characteristics of an SCR in detail:

Unijunction Device

  • An SCR is not a Unijunction device. A Unijunction transistor (UJT) is a three-terminal device whereas an SCR is a four-layer, three-junction device.


Device with 3 Junctions

  • An SCR is a device with three junctions. It consists of four alternating layers of P-type and N-type semiconductor material, creating three P-N junctions.


Device with 4 Junctions

  • An SCR is not a device with four junctions. It has three junctions which play a crucial role in its operation as a controlled rectifier.


In conclusion, an SCR is a semiconductor device with three junctions that is commonly used in electronic circuits for switching and control applications. It is essential to understand the structure and characteristics of an SCR to effectively utilize its capabilities in various electronic systems.


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A silicon controlled rectifier (SCR) is aUnijunction device.Device with 3 junctions.Device with 4 junctions.None of the above?
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