How does current flow through a transistor?

We know that in transistors and diodes, electric current is carried by both free electrons and holes. Free electrons and holes travel in opposite directions. For example, if free electrons flow from left to right then the holes will flow from right to left.

How does a current amplifier work?

A Current amplifier is an electronic circuit that increases the magnitude of current of an input signal by a fixed multiple, and feeds it to the succeeding circuit/device. Ideally, during this process of current amplification, the current amplifier will keep the voltage component of the input signal unchanged.

What is the role of the transistor in this circuit?

A transistor is a semiconductor device used to amplify or switch electrical signals and power. The transistor is one of the basic building blocks of modern electronics. It is composed of semiconductor material, usually with at least three terminals for connection to an electronic circuit.

In which type of transistor does current flow from the base to the emitter?

And the answer depends on the type of transistor in use. In an NPN transistor, current actually flows from the collector to the emitter. In a PNP transistor, it’s exactly the opposite. In a PNP transistor, current flows from the emitter to the collector.

Which configuration of transistor is called current buffer?

The current gain of Common Base configuration (CB) is unity hence it can be used as a current buffer. Similarly, Common Collector CC is used as a voltage buffer. CC configuration is also called a Voltage follower or emitter follower circuit.

What is the current gain of a transistor?

The transistor is able to control a high current flowing thru the transistor from collector to emitter by a small current current flowing from base to emitter, so its said to have a current gain. The transistor does not create the current, it simply controls the current flowing around the loop.

What is the difference between transistor and amplifier?

Transistor are current controlled devices which control the flow of current thru a load, not voltage. The voltages measured in a simple single stage amplifier are due to the current flowing from the positive terminal to the negative terminal of the current source that is powering the amplifier.

What is a transistor made of?

A transistor consists of three layers of a semiconductor material. Those layers are capable of carrying a current. Transistors are devices that can amplify a signal in a circuit. It is normally made of germanium or silicon layers. A transistor requires very little current to operate so, releases very little heat.

What happens if the base voltage of a transistor is 50mV?

If the voltage on the base rises by 50mV, the transistor will turn ON more and the voltage on the collector will drop to say 3v. At the same time we may only need a current of 0.1mA to deliver 50mV rise into the base of the transistor and the collector may be able to deliver 1mA and 3v to an external load.