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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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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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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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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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.
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Transformer, being a stationary electrical equipment, does not have rotational or windage losses. The losses which occur in a transformer are, Copper losses Iron or core losses.
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A Split Phase Induction Motor is a type of single-phase motor that has two windings: a main winding and a starting winding. The primary feature of this motor is its ability to create a phase difference between the currents in the main and starting windings, which helps generate the necessary starting torque. Fig. 1. Split
Megger is a portable instrument for measuring high resistances in which the voltage range can be controlled by using a voltage selector switch. It is not only used for measurement of high resistances (insulation resistance), but also can be used for testing of insulation resistance. One more advantage is that deflection of the instrument is
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It is also the gas discharge lamp in which sodium is used, so this is called as the sodium vapour lamp. Fig. 1. Sodium Vapour Lamp.
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Thevenin’s Theorem is very useful particularly when the current in one branch of a network is to be determined. Statement of Thevenin’s Theorem Thevenin’s Theorem states that for the purpose of determining the current through a resistor RL (called load resistance) connected across any two terminals A and B of a linear bilateral network with
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