Question

What are the three terminals of an SCR?

Answer 1

The three terminals of a Silicon Controlled Rectifier (SCR) are:

1. Anode (A): This is the positive terminal of the SCR. The current enters the SCR through the anode.
   

1. Cathode (K): This is the negative terminal of the SCR. The current exits the SCR through the cathode.
   

1. Gate (G): This is the control terminal. A small voltage or current applied to the gate allows the SCR to turn on and start conducting between the anode and cathode.
   

In summary:

1. Anode (A): Positive side, current flows in.
   

1. Cathode (K): Negative side, current flows out.
   

1. Gate (G): Controls the switching of the SCR.
   

When the gate is triggered (with a small current), the SCR allows current to flow from anode to cathode. Once it's conducting, the SCR will continue to do so until the current through it drops below a certain level (the "holding current").