Question

In the common-emitter transistor input signal is between

• A. Any where
• B. Emitter-collector
• C. Collector-Base
• D. Base-emitter

Answer 1

The correct option is D

Base-emitter

The explanation for the correct answer:

Transistor:

1. It is a semiconductor device used to regulate current flow or voltage signals, it is also used as a switch/gate.
2. A transistor consists of three layers Emitter, Base, and Collector. These are basically either p-type or n-type.
   .
3. Most of the transistors we study are PNP transistors, For this type of transistors to allow the flow of current they have to be forward biased.
4. For a PNP transistor to be forward-biased the base need to have a lower voltage compared to the Emitter and Collector.
5. The current flow is from the emitter to the collector.
6. In a common-emitter transistor, the Emitter is grounded.

In case of option D:

1. When the input signal is connected between the emitter and the base.
2. 
3. As the emitter is common and the collector gives the output current for the two circuits to be forward-biased the input has to be between the base-emitter.
4. It is clearly shown in the figure.

Hence the correct answer is option D