Question 360Electricity & Electronics - QMED

The correct answer is C) a bidirectional SCR with a common gate. A triac thyristor is a semiconductor device that functions as a bidirectional switch, capable of conducting current in both directions. This is similar to a bidirectional SCR (silicon-controlled rectifier) with a common gate terminal, which allows the device to be triggered and conduct in either direction. The other options are not accurate comparisons for a triac thyristor. A diode in series with a temperature-sensitive capacitor (option A) does not exhibit the bidirectional switching behavior of a triac. A triode tube with a heavy grid (option B) is a different type of vacuum tube device, not a semiconductor. Two NPN transistors in parallel (option D) would not provide the same functionality as a single triac thyristor.