What Is The Principle Of Transistor?

What is transistor and how it works?

A transistor works when the electrons and the holes start moving across the two junctions between the n-type and p-type silicon.

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..

What is transistor and its types?

Transistors are basically classified into two types; they are Bipolar Junction Transistors (BJT) and Field Effect Transistors (FET). The BJTs are again classified into NPN and PNP transistors. The FET transistors are classified into JFET and MOSFET.

What is base transistor?

Base – The middle section of the transistor is known as the base. The base forms two circuits, the input circuit with the emitter and the output circuit with the collector. The emitter-base circuit is in forward biased and offered the low resistance to the circuit.

What is use of diode?

The most common function of a diode is to allow an electric current to pass in one direction (called the diode’s forward direction), while blocking it in the opposite direction (the reverse direction). … These techniques are used to create special-purpose diodes that perform many different functions.

What is the working principle of a transistor?

For an NPN transistor, it consists of a layer of P-doped semiconductor between two layers of N-doped material, where electrons are passed from the emitter to the collector instead. The emitter then “emits” electrons into the base, with the base controlling the no. of electrons the emitter emits.

What devices use transistors?

By far the most common application of transistors today is for computer memory chips—including solid-state multimedia storage devices for electronic games, cameras, and MP3 players—and microprocessors, where millions of components are embedded in a single integrated circuit.

What is P type transistor?

A transistor has two inputs, called gate and source, and one output, called drain. … Logisim supports two types of transistors, with slightly different behaviors described below; the P-type transistor is indicated by a circle connecting the gate input to its plate, while the N-type transistor has no such circle.

What are the advantages of transistors?

Advantages of Transistor:Smaller mechanical sensitivity.Lower cost and smaller in size, especially in small-signal circuits.Low operating voltages for greater safety, lower costs, and tighter clearances.Extremely long life.No power consumption by a cathode heater.Fast switching.

What are two basic types of junction transistors used today?

There are two most common transistor types today: the Metal -Oxide – Semiconductor or MOS and the Bipolar Junction Transistor or BJT. The MOS is also designated as MOSFET because it is a field effect transistor (FET).

How do you read a transistor?

Hook the positive lead from the multimeter to the to the BASE (B) of the transistor. Hook the negative meter lead to the EMITTER (E) of the transistor. For an good NPN transistor, the meter should show a voltage drop between 0.45V and 0.9V. If you are testing PNP transistor, you should see “OL” (Over Limit).

What are the two main types of transistors?

Types of transistorThere are two types of standard (bipolar junction) transistors, NPN and PNP, with different circuit symbols as shown. … The leads are labelled base (B), collector (C) and emitter (E). … In addition to bipolar junction transistors, there are field-effect transistors which are usually referred to as FETs.More items…

What is transistor diagram?

Transistor currents The diagram shows the two current paths through a transistor. The small base current controls the larger collector current. When the switch is closed a small current flows into the base (B) of the transistor.

Why is VBE 0.7 V?

For an unbiased transistor, considering only the BE junction which is a pn junction diode, 0.7V is the potential barrier. In an npn transistor base is positive(p) and emitter is negative(n). … But in a pnp transistor the base is negative(n) and emitter is positive(p) so the vbe=-0.7V.

What is the unit of transistor?

The standard units of electrical measurement used for the expression of voltage, current and resistance are the Volt [ V ], Ampere [ A ] and Ohm [ Ω ] respectively….Standard Electrical Units of Measure.Electrical ParameterChargeMeasuring UnitCoulombSymbolQDescriptionUnit of Electrical Charge Q = C × V9 more columns

Why it is called transistor?

The name transistor is derived from “transfer resistor” it means that the resistance is changed. It is a solid state device which is made up of silicon and germanium. Hence the function of a transistor is to change the resistance for various applications using its specifications.

Where do we use transistor?

Transistors are commonly used in digital circuits as electronic switches which can be either in an “on” or “off” state, both for high-power applications such as switched-mode power supplies and for low-power applications such as logic gates.

How do you connect a transistor?

To connect the transistor as a switch in a circuit, we connect the output of the device that will switch on the transistor to the base of the transistor. The emitter will connect to ground of the circuit. And the collector will connect to the load that the transistor will turn on and the supply voltage of the circuit.

What is transistor and symbol?

Transistor Symbol. A diagrammatic form of n-p-n and p-n-p transistor is exposed. In circuit is a connection drawn form is used. The arrow symbol defined the emitter current.

What is transistor action?

So in a NPN Transistor it is the movement of negative current carriers (electrons) through the Base region that constitutes transistor action, since these mobile electrons provide the link between the Collector and Emitter circuits.

What is difference between PNP and NPN transistor?

The main difference between the two types of transistors is that holes are the more important carriers for PNP transistors, whereas electrons are the important carriers for NPN transistors. Then, PNP transistors use a small base current and a negative base voltage to control a much larger emitter-collector current.