| Electrical Parameter Measuring Unit Symbol | Current Ampere I or i | Resistance Ohm R or Ω | Conductance Siemen G or ℧ | Capacitance Farad C |
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What is a transistor symbol?
The Transistor is a semiconductor device provided with three terminals called base, emitter and collector. It is used to work in electronic circuits as a rectifier, amplifier and switch. These symbols can be represented inside a circle .
What is the formula of transistor?
A transistors current gain is given the Greek symbol of Beta, ( β ). As the emitter current for a common emitter configuration is defined as Ie = Ic + Ib , the ratio of Ic/Ie is called Alpha, given the Greek symbol of α. Note: that the value of Alpha will always be less than unity.
What is transistor function?
Transistor, semiconductor device for amplifying, controlling, and generating electrical signals . Transistors are the active components of integrated circuits, or “microchips,” which often contain billions of these minuscule devices etched into their shiny surfaces.
What are the 2 types of transistors?
Transistors typically fall into two main types depending on their construction. These two types are bipolar junction transistors (BJT) and Field Effect Transistors (FET) .
What is transistor with diagram?
Diagram ‘A’ shows an NPN transistor which is often used as a type of switch. A small current or voltage at the base allows a larger voltage to flow through the other two leads (from the collector to the emitter). The circuit shown in diagram B is based on an NPN transistor.
Why is VBE 0.7 V?
The base emitter junction is a PN junction or you can consider that as a diode. And the voltage drop across a silicon diode when forward biased is ~0.7V. That is why most of the books write VBE=0.7V, for an NPN silicon transistor with forward biased emitter junction at room temperature.
What is BJT formula?
The current gain A i of common collector BJT is given by the ratio of output current I E to input Current I B : I E = I C + I .
What is PNP transistor?
The PNP transistor is a type of transistor in which one n-type material is doped with two p-type materials . It is a device that is controlled by the current. Both the emitter and collector currents were controlled by the small amount of base current. Two crystal diodes are connected back-to-back in the PNP transistor.
Is zener a diode?
A Zener diode is a silicon semiconductor device that permits current to flow in either a forward or reverse direction. The diode consists of a special, heavily doped p-n junction, designed to conduct in the reverse direction when a certain specified voltage is reached.
What are the two basic function of transistor?
A transistor is a kind of solid semiconductor device, which has many functions, such as detecting, rectifying, amplifying, switching, voltage stabilizing, signal modulating and so on. As a variable current switch, the transistor can control the output current based on the input voltage.
What is difference between transistor and thyristor?
The crucial difference between transistor and thyristor is that a transistor is a 3-layer device that requires regular current pulse in order to ensure conduction . On the contrary, a thyristor is a 4-layer device that needs an only single triggering pulse to initiate and maintain conduction.
What type of transistor is used?
A transistor is a semiconductor device used to amplify or switch electronic signals. Transistors are broadly divided into three types: bipolar transistors (bipolar junction transistors: BJTs), field-effect transistors (FETs), and insulated-gate bipolar transistors (IGBTs).
What is PNP and NPN transistor?
NPN and PNP refer to the arrangement of the pieces that make up the transister . ... An NPN transistor has a piece of P-type silicon (the base) sandwiched between two pieces of N-type (the collector and emitter). In a PNP transistor, the type of the layers are reversed. Below is a typical cross section of a transistor.
What is IGBT stands for?
IGBT stands for insulated-gate bipolar transistor . Figure (a) shows the symbol of an IGBT. It is a power transistor that combines an input MOS and an output bipolar transistor.
Why do transistors have 3 legs?
The transistor has three legs, these are the base, collector and the emitter. ... The base of the transistor is used to switch current through the collector and emitter . When the base is between 0V and 0.7V it is switched off and above 0.7V it is switched on allowing the current to flow from the collector to the emitter.
