Electrical

Moving-iron Frequency Meter Working Principle of Moving-iron Frequency Meter: The action of Moving-iron Frequency Meter depends on the variation in current drawn by two parallel circuits – one inductive and …

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Electrodynamic Frequency Meter Electrodynamic Frequency Meter is also referred to as moving-coil frequency meter and is a ratiometer type of instrument. Working Principle of Electrodynamic Frequency Meter: The working principle …

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The Vibrating-reed Frequency Meter Working Principle – The Vibrating-reed Frequency Meter: The Vibrating-reed Frequency meter depends for its indication on the mechanical resonance of thin flat steel reeds arranged alongside …

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Vibration Galvanometer Vibration Galvanometers are widely used as null-point detectors in A.C. bridges. Construction of Vibration Galvanometers As shown in Figure A, it consists of a moving coil suspended between …

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Induction Type Wattmeters The two main types of wattmeters are The dynamometer or electrodynamic type wattmeter and the induction type wattmeters. Induction Type Wattmeters Principle of induction type wattmeters is …

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Dynamometer or Electrodynamic Type Wattmeter The two main types of wattmeters are The dynamometer or electrodynamic type wattmeter and the induction type wattmeter. Dynamometer or Electrodynamic Type Wattmeter The basic …

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Electrostatic Voltmeters Electrostatic instruments such as Electrostatic Voltmeters are almost always used as voltmeters and that too more as a laboratory rather than as industrial instruments. The underlying principle of …

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Induction Voltmeter Construction of Induction Voltmeter is similar to that of an induction ammeter except for the difference that its winding is wound with a large number of turns of fine …

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Induction Ammeters It has been shown in Article Induction type Voltmeters and Ammeters  above that the net torque acting on the disc of Induction Ammeters is T = K2 ωΦ1m …

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Induction type Voltmeters and Ammeters Induction type Voltmeters and Ammeters (instruments) are used only for A.C. measurements and can be used either as ammeter, voltmeter or wattmeter. However, the induction …

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