Explain the characteristics of SCR and Traic.

A Silicon-Controlled Rectifier (SCR) and a Triac are both semiconductor devices used for power control applications, especially in AC and DC circuits. While SCR is a unidirectional device, the Triac is bidirectional. Both devices have unique characteristics that determine their performance and applications.  

### Characteristics of SCR (Silicon-Controlled Rectifier)  
SCR is a four-layer, three-terminal semiconductor device with an anode (A), cathode (K), and gate (G). It operates as a controlled rectifier and functions as a switch in DC and AC circuits.  

1. Unidirectional Conductance  
   - SCR conducts current only in one direction, from anode to cathode.  
   - It blocks reverse voltage, making it suitable for DC applications.  

2. Latching Behavior  
   - Once triggered by a gate pulse, the SCR remains in conduction mode even after the gate pulse is removed.  
   - To turn it off, the anode current must fall below the holding current _________ ___ _________ _________ _____ ___ _______ ________ _______.
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