# Electrical Terms

## Piezo-Electric Transducer

Definition: The Piezoelectric transducer is an electroacoustic transducer use for conversion of pressure or mechanical stress into an alternating electrical force. It is used for measuring the physical quantity like force, pressure, stress, etc., which is directly not possible to measure. The piezo transducer converts the physical quantity into an electrical voltage which is easily measured …

## Three Phase Energy Meter

Definition: The meter which is used for measuring the power of three phase supply is known as the three phase energy meter. The three phase meter is constructed by connecting the two single phase meter through the shaft. The total energy is the sum of the reading of both the elements. Working Principle of Three …

## Creeping in Energy Meter

Definition: Creeping in energy meter is the phenomenon in which the aluminium disc rotates continuously when only the voltage is supplied to the pressure coil, and no current flows through the current coil. In other words, the creeping is the kind of error in which the energy meter consumes a very small amount of energy even …

## Energy Meter

Definition: The meter which is used for measuring the energy utilises by the electric load is known as the energy meter. The energy is the total power consumed and utilised by the load at a particular interval of time. It is used in domestic and industrial AC circuit for measuring the power consumption. The meter …

## Megger

Definition: The Megger is the instrument uses for measuring the resistance of the insulation. It works on the principle of comparison, i.e., the resistance of the insulation is compared with the known value of resistance. If the resistance of the insulation is high, the pointer of the moving coil deflects towards the infinity, and if it …

## Thermocouple Instrument

Definition: The instrument which uses the thermocouple for the measurement of the temperature, current and voltage such type of instrument is known as the thermocouple instrument. It is used for both the AC and DC measurement. The thermocouple is an electric device which uses two wires of the different metal. It’s work on the principle that …

## Ohmmeter

Definition: The meter which measures the resistance and the continuity of the electrical circuit and their components such type of meter is known as the ohmmeter. It measures the resistance in ohms. The micro-ohmmeter is used for measuring the low resistance and the mega ohmmeter measures the high resistance of the circuit. The ohmmeter is very …

## Hot Wire Instrument

Definition: The instruments which use the heating effect of the current for knowing their magnitude such type of instrument is known as the hot wire instrument. It works on the principle that the length of the wire increases because of the heating effect of the current flow through it. The hot wire instrument is used …

## Moving Iron or MI Instrument

Definition: The instrument in which the moving iron is used for measuring the flow of current or voltage is known as the moving iron instrument. It works on the principle that the iron place near the magnet attracts towards it. The force of attraction depends on the strength of the magnet field. The magnetic field …

## Permanent Magnet Moving Coil or PMMC Instrument

Definition: The instruments which use the permanent magnet for creating the stationary magnetic field between which the coil moves is known as the permanent magnet moving coil or PMMC instrument. It operates on the principle that the torque is exerted on the moving coil placed in the field of the permanent magnet. The PMMC instrument gives …