Inductor Types and Symbols

Typical power supply inductor

In spite of the great number of different kinds of inductors, only a few schematic symbols are needed to represent them. Filter Choke A filter choke for a power supply is shown in figure 1 (a), and its symbol is shown in figure 1(b). Fig.1: Iron Core Choke Coil: (a) …

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Capacitor Types | Fixed and Variable Capacitors

Cross-Sectional View of a Typical Plastic Film Capacitor

Variable capacitors Variable capacitors are distinguished by the fact that their capacitance can be changed. Basically, there are two most common types of such capacitors named as a trimmer and rotor-stator capacitors. Rotor-Stator Capacitor The rotor-stator type of capacitor comprises two metallic plate sets. The moving plates are attached conjointly …

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A

Average Value The sum of the instantaneous voltages in a half cycle wave shape divided by the number of instantaneous voltages. In a sine wave, it is equal to 0.637 times the peak voltage. Analog meters Analog meters are a multifunctional multimeter that operates based on electrical mechanical movement. Autotransformer A …

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Ohm’s Law Definition | Ohm’s Law Formula

Ohm’s Law Definition Ohm’s law states that the current in an electric circuit is proportional to the applied voltage and inversely proportional to its resistance. As the voltage increases in a circuit (resistance remaining constant), the current increases by the same amount. Hence, if the voltage is doubled, the current …

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B

Branch In a parallel circuit, each current path is a Branch. Band-Pass Filter A resonant circuit that is tuned to pass a single band of frequencies and to attenuate all other signals. Band-Rejection Filter A network that attenuates a single band of frequencies and allows those on either side to …

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C

Capacitance The property of a circuit that permits the storage of an electric charge when a difference of voltage is applied. Current Electric current is the rate of flow of charge in a conductor. Current Limiting Resistor A resistor inserted into an electric circuit to limit the current to some …

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Capacitive Reactance in AC Circuit

Capacitive Reactance The AC Current flow in a capacitor depends on the supply voltage and the capacitive reactance. The capacitance value and the supply frequency determine the capacitive reactance. The alternating current through a capacitor leads the capacitor terminal voltage by 90o as shown in the figure below. If a …

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Inductive Reactance in AC Circuit

Inductive Reactance Alternating current flow in an inductor depends on the applied voltage and on the inductive reactance of the inductor. The inductive reactance is proportional to the inductance value and the frequency of the alternating supply voltage. When an alternating voltage is applied to a pure inductance, the current …

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D

Discrete Time System When the time variable t takes on the discrete values t=kT, k=…,-2,-1, 0, 1, 2… the system is said to be discrete – time system. Dependent Sources  Voltage or current source whose value linearly depends upon the value of voltage or current of other elements in the …

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E

Electromagnet An electromagnet is composed of a coil of wire wound around a core of a soft iron. Electron A negatively charged subatomic particle with much less mass than a proton but with a charge equal and opposite to the charge of a proton. Energy Energy is the capacity to …

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F

Farad The SI unit of capacitance is Farad, named in honor of the English physicist and chemist Michael Faraday. The unit symbol for the farad is F. Fuse A protective device containing a special wire that melts when excessive current passes through it, thereby opening the circuit. Filter A selective …

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G

Ground A conductor providing either a common return path to the voltage source or a zero reference point, which makes it possible to obtain positive or negative voltages (with respect to ground) from the same power supply. Gauss-Seidel method An iterative technique for solving a set of nonlinear equations (e.g., …

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H

Horse Power (HP) Horse Power is a measure of the work output of a motor (electrical or otherwise). The conversion from HP to watts is 1 HP = 746 Watts (Imperial Units). Hertz The SI unit of frequency; equal to one cycle per second. Henry The SI unit of inductance …

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