How does transistor acts as an amplifier and switch?

When a transistor works in an active region the transistor acts as an Amplifier and when it works as a Switch it works in Cutoff and Saturation Regions. The transistor in a Cutoff State both collector base and the Emitter base junctions are reverse biased.

How is a transistor used as an amplifier?

A transistor acts as an amplifier by raising the strength of a weak signal. The DC bias voltage applied to the emitter base junction, makes it remain in forward biased condition. Thus a small input voltage results in a large output voltage, which shows that the transistor works as an amplifier.

Can transistors act as amplifiers or switches?

By turning a small input current into a large output current, the transistor acts like an amplifier. But it also acts like a switch at the same time. When there is no current to the base, little or no current flows between the collector and the emitter. Turn on the base current and a big current flows.

What is transistor oscillator?

An oscillator is an electronic circuit that generates repeated waveforms. One of the most commonly used oscillator circuits is made from a pair of transistors that are rigged up to alternately turn on and off. This type of circuit is called a multivibrator.

When transistor acts as an amplifier then in which region transistor is operating?

A transistor in an active region behaves like an amplifier. To achieve amplifying action of the transistor its input and output junctions must be biased accordingly. Complete answer: A transistor is a three terminal device that has an emitter, base, and a collector.

In which region transistor acts as a switch?

saturation region
Transistor acts as a switch in the saturation region and cutoff region. The emitter-base junction and the collector-base junction is reverse biased in the cutoff region. Both the junctions are forward biased in the saturation region.

In which region transistor acts as an open switch?