Basic Electronics

Definition: The word Transistor is formed from two words, one is “Transfer” and other is “Varistor”. This implies a device which transfers resistance from one channel of the circuit to other is called transistor.  It is a three terminal current controlled device which can either be operated as switch or amplifier by providing small signal voltage. It is one of the significant types of active devices. Significance and History of Transistor You must be thinking what is the need of … [Read more...] about Transistor

Definition: Bleeder Resistor is a standard resistor which is connected in parallel with the capacitor of the filter circuit to provide discharging of the capacitor. If the capacitor is not discharged properly, then it may lead to an electric shock to the person operating it. Thus, to ensure the safety of the operators working with it, it is necessary to connect a resistor in parallel with the capacitor. Significance of Bleeder Resistor To understand the significance of bleeder resistor, … [Read more...] about Bleeder Resistor

Definition: Secondary Electron Emission is the phenomenon in which the primary electrons strikes the free electrons in the metal and impart their energy to them so that they can leave the metal surface. The electrons emitted by this process are called secondary electrons. And this process is called Secondary emission. Visualization of Secondary electron Emission Consider an electron source and an emitter made of metal is placed inside the evacuated tube filled with inert gases. It needs to be … [Read more...] about Secondary Electron Emission

Definition: Thermionic effect or Thermionic Emission can be defined as the phenomenon in which electrons are emitted from the surface of the metal when heat energy is applied to the metal. The word Thermionic is formed from the words Thermal and ions. Thermal means heat and ions are charged particles. Thermionic emission depends on three factors, temperature of the metal surface, area of the metal surface and last but not the least the work function of the metal. Significance of Thermionic … [Read more...] about Thermionic Emission

Definition: Photoelectric emission is the phenomenon by which intensity of light is utilized for the removal of the electron from the atom. The word Photoelectric is formed from two words photo which means light (Photons) and electric which is related to electron. Thus, light radiation or photons impart their energy for electron emission. That’s why it is called photoelectric emission. Significance of Photoelectric Emission Photoelectric emission is significant for determining the intensity of … [Read more...] about Photoelectric Emission

Definition: Capacitor is an electronic component which stores energy in the form of the electric field. When a voltage of some magnitude is applied across the capacitor, then the electric field is created across the plates of a capacitor. Thus, it stores charge due to the static electric field. This stored charge can be used by discharging of capacitor whenever needed. The capacitance is the property of the capacitor which indicates its ability to store charge. It is measured in farads. … [Read more...] about Capacitor

Definition: Inductor is a device which stores energy in the form of magnetic field. When current flows through the inductor, it varies the flux linked with the component. Due to this magnetic field is induced around the inductor and thus the inductor stores energy in the form of magnetic field. In a circuit, inductor opposes the sudden change of current in magnitude and direction. When current changes suddenly in magnitude or direction, then inductor induces a voltage. The inductor possesses … [Read more...] about Inductor

Definition: Resistor is an electronic device which is used to provide an obstruction in the path of current. Resistors are used in electronics circuits for various applications. It is used as the load in amplifier circuits. A resistor is used with the capacitor to provide discharge of capacitor when the power supply is removed. It is also used in filter circuit with inductor and capacitor. Characteristics of Resistors The resistor has two characteristics which are resistance and power … [Read more...] about Resistor

Have you ever thought why we need a Kirchhoff’s Circuit law? Your answer might be that Kirchhoff’s Circuit law is used to find current and voltage in electronic circuits but then what about Ohm’s law? Because Ohm’s law can also be used to determine current and voltage in electronic circuits, but still we need Kirchhoff’s circuit law, why is it so? The answer to this question is, in the case of complicated circuits such as Bridge and T-networks we cannot find current and voltage circulating in … [Read more...] about Kirchhoff’s Law

Definition: Electronic components are the elements of circuit which helps in its functioning. They can be classified into two types i.e. Active Components and Passive Components. Active elements are those which possess gain. They can give energy to the circuit. On the contrary passive elements do not possess gain and they cannot give energy continuously to the circuit. Passive components cannot amplify or energize the energy of the signal associated with them, they can only attenuate it, … [Read more...] about Electronic Components