A transistor can act as which of the following?

A transistor can act as which of the following?

• A. Amplifier
• B. All of the above
• C. Oscillator
• D. Switch

Answer: (B)

A transistor is an active device that can control a larger current with a smaller input signal, allowing it to perform multiple roles in circuits. As an amplifier, a small signal applied to the control terminal modulates a much larger current between the other two terminals, providing gain. As a switch, it can be biased into cutoff or saturation to toggle a load on and off, which is the basis of digital logic and power switching. As an oscillator, when placed with the right feedback network and biasing, it can sustain periodic oscillations at a desired frequency, such as in LC or RC oscillator configurations. Because it can fulfill all of these roles, the correct conclusion is that all of these applications are possible with a transistor.

A transistor is an active device that can control a larger current with a smaller input signal, allowing it to perform multiple roles in circuits. As an amplifier, a small signal applied to the control terminal modulates a much larger current between the other two terminals, providing gain. As a switch, it can be biased into cutoff or saturation to toggle a load on and off, which is the basis of digital logic and power switching. As an oscillator, when placed with the right feedback network and biasing, it can sustain periodic oscillations at a desired frequency, such as in LC or RC oscillator configurations. Because it can fulfill all of these roles, the correct conclusion is that all of these applications are possible with a transistor.