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What is Constant Voltage Transformer (CVT)? Working Principle, Diagram & Applications

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A constant voltage transformer (CVT) works on ferro-resonant principle. The variation in the primary flux with an unsaturated iron core does not affect the secondary flux with saturated iron core. Thus, the secondary induced voltage remains relatively independent of the voltage impressed upon the primary winding. Fig. 1: Constant Voltage Transformer (CVT).

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What is Ward Leonard Method of Speed Control? Working Principle, Diagram & Applications

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A smooth variation of speed from zero to above normal with inherent stability of speed at all loads is achieved through an adjustable voltage system of speed control called Ward-Leonard Method of speed control. Fig. 1: Ward Leonard Method of Speed Control.

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What is Fibre Optic Cable? Theory, Construction, Advantages & Disadvantages

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Fibre Optic Cable carry light signals instead of the electric signals. They are used for light and infrared transmissions. Fig. 1: Construction of Fibre Optic Cable.

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What is Hot Wire Anemometer? Working, Advantages & Applications

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Hot Wire Anemometer (or Thermal Flow Meter) makes use of temperature coefficient effect i.e. the resistance of conducting material changes with change in temperature. Fig. 1 : Hot wire anemometer.

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What is TRIAC? Working, Characteristics, Symbol & Applications

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TRIAC is a bilateral power device which operates in both the forward and reverse mode. Its operation is similar to two parallel SCRs connected in opposite direction with a common gate terminal as shown below. The construction shown in Fig. 1 (a) and symbol as shown in 1 (b). (a) (b) Fig. 1: Construction and

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What is Mercury Vapour Lamp? Working, Diagram, Construction & Uses

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The lamps in which the light is produced due to the how of electrons through the gas are known as the gas discharge lamps. Mercury Vapour Lamp is a gas discharge lamp. It has high operating pressure with mercury vapours, so it is called as the high pressure mercury vapour lamp. Figure 1: Mercury Vapour

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What is Vapour Pressure Thermometer? Working, Construction, Diagram & Applications

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In Vapour Pressure Thermometers, a filling substance may be liquid, gas or vapour. Vapour pressure thermometer falls in the category of filled system thermometer. Working and Construction of Vapour Pressure Thermometer Figure 1: Vapour Pressure Thermometer.

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What is Weston Type Frequency Meter? Construction, Working & Diagram

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Construction of Weston Type Frequency Meter The construction and connection diagram of the Weston type frequency meter is shown in the Figure 1. It consists of two coils, coil-1 and coil-2 (each divided into two parts) which are placed perpendicular to each other. Figure (1): Weston Type Frequency Meter.

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What is Frequency Meter? Construction, Working & Types

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The number of cycle per second of the alternating quantity is known as the frequency. The instruments used to measure frequency called Frequency Meter.

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Moving Iron Instrument (or MI Instrument) – Working, Diagram & Types

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In Moving Iron instruments (or MI Instruments), an iron piece moves, when repelled (or attracted) by the magnetic field of a coil. With the moving piece, a pointer is attached which shows deflection on a calibrated scale. These instruments are simple, cheap and reasonably accurate and can be used for ac/dc measurements hence find extensive

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