What is Field Effect Transistor (FET) | Types

Field-Effect-Transistor-

Bipolar junction transistor (BJT) is a current-driven device. The input current to the device controls the output current. From the point of view of efficiency this type of transistor consumes a relatively high amount of energy due to high current, which converts to heat; thus, the efficiency is low. There are …

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Transistor as an Amplifier | Theory | Working Principle

Transistor as an Amplifier

A transistor can amplify the current or voltage of a signal. Amplifying current implies that the transistor output current is higher than its input current. Amplifying voltage implies that the voltage variation of the output is higher than the voltage variation of the input. When putting together, a number of …

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Transistor as a Switch Theory

Transistor as a Switch Theory

In the following circuit, the transistor acts as a switch, in the same way, that a relay works. The advantage of a transistor to a relay is that a transistor is lighter, has less noise (if any at all), has no moving components, it is faster, consumes less energy and …

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Switching and Amplification of Transistor

Switching and Amplification of Transistor

Two principal functions of a transistor are switching and amplification. In order to better understand what is meant by switching and amplification, we examine the following two examples. Switching Function Suppose that the current in a motor when working is 30 A. Dissimilar to a household device that you turn …

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Transistor | Basics | Modes of Operation | Biasing

Transistor | Basics | Modes of Operation | Biasing

A transistor is a semiconductor device with many applications. It is, in fact, the mother of all the other semiconductor electronic devices that we use or see around us today. Before transistors were invented, all electronic devices were made with vacuum tubes. Still one can find devices such as stereo …

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Binary Number System | Basics | Definition

Binary Number System

Definition: Digital electronic circuits can be made to act in only two states: on and off. This two-state system is called a binary number system. This system can be compared to a single-pole, single-throw (SPST) switch, Figure 1. A switch in the off position represents a 0 in the binary …

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Diac & Triac | Basics | Characteristics Curve

Diac and triac are two devices, usually used together for current control in AC circuits. The names are made based on “diode for AC” and “triode for AC.” Although you now know about solid-state diode, the counterpart of that in vacuum tubes was also called diode; a tube with two …

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Diode | Working Principle | Construction

diode symbol

Definition: A diode is the simplest semiconductor component. It is made of only two pieces from different semiconductor materials. Nonetheless, you may find diodes in almost all electronic circuits. Diode Working Principle Its function is to let electric current flow in one direction but to prevent flow in the opposite …

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Diode Characteristic Curve Explanation

Diode Characteristic Curve

A typical characteristic curve for a diode is shown in Figure 1. This curve shows the variation of the diode current versus the voltage across the diode. On the right-hand side of the vertical axis (the current axis), a diode is forward biased because the voltage applied across it is positive. …

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Wound Rotor & Squirrel Cage Induction Motor Theory

Wound Rotor & Squirrel Cage Induction Motor Theory

Asynchronous machines are more known as induction motors because their principle of operation is based on induction. Recalling Faraday’s law, if a wire is moved in a magnetic field, then a voltage difference is generated between its two ends. We may also say a voltage or an electromotive force is induced …

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