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.
What is Ward Leonard Method of Speed Control? Working Principle, Diagram & Applications Read More »
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.
What is Fibre Optic Cable? Theory, Construction, Advantages & Disadvantages Read More »
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.
What is Hot Wire Anemometer? Working, Advantages & Applications Read More »
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
What is TRIAC? Working, Characteristics, Symbol & Applications Read More »
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
What is Mercury Vapour Lamp? Working, Diagram, Construction & Uses Read More »
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.
What is Vapour Pressure Thermometer? Working, Construction, Diagram & Applications Read More »
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.
What is Weston Type Frequency Meter? Construction, Working & Diagram Read More »
The number of cycle per second of the alternating quantity is known as the frequency. The instruments used to measure frequency called Frequency Meter.
What is Frequency Meter? Construction, Working & Types Read More »
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
Moving Iron Instrument (or MI Instrument) – Working, Diagram & Types Read More »
The AC series motor is designed to work on AC and DC both. The stator is made of laminations of silicon steel to reduce the hysteresis and eddy current losses. The armature of the universal motor is the same as that of the ordinary series motor. Figure 1: AC Series Motor.
What is an AC Series Motor? Working, Diagram, Construction & Applications Read More »