TG EAMCET 3 May 2025 Shift 1 Paper

To use transistor as a switch in a common emitter configuration, the transistor operates in cutoff and saturation region.
In cutoff region, the transistor is "off" and acts like an open switch, allowing no current to flow between the collector and emitter.
In saturation region, the transistor is "on" and acts like a closed switch (short circuit) between the collector and emitter, allowing maximum current to flow.
In active region, transistor works as an amplifier.