Induction Type Wattmeter

Induction Type Wattmeter Induction type wattmeter can be used to measure as power only. In last article we have studied about dynamometer type wattmeter which can be used to measure dc as well as ac power. Working Principle  Induction type wattmeter works on induction principle. Construction of induction type wattmeter Induction type wattmeter consists of […]

Permanent Magnet Moving Coil Instruments

Permanent Magnet Moving coil  Instruments (PMMC) Permanent Magnet Moving coil  Instruments  are  moving coil instruments. These instruments are very sensitive and accurate. DC voltage or current can be measured by these instruments. Principle of Operation The operation of PMMC instrument is based on the principle when a current carrying conductor placed in a magnetic field, a mechanical […]

Electrical Instrument

Electrical Instruments Electrical instruments are used to measure electrical quantities such as current, voltage, power, energy, frequency, power factor, resistance etc. To measure these quantities several instruments such as ammeter, voltmeter, wattmeter, energy meter are used. In simple words we can say that the instruments which are used to measure electrical quantities are known as […]

Dynamo Type Wattmeter

Dynamo Type Wattmeter A Dynamo type wattmeter variably used for measurement of ac power as well as dc power. Working Principle It works on the dynamo meter principle. According to this principle,  a mechanical force exists between two current carrying conductors when current passed through the conductors. Construction There are two coils are used in […]


Wattmeter Wattmeter is an instrument which is used to measure electric power in the circuit. It measure electrical power in watt. Electric power is the product of current and voltage but in case of ac circuits power factor (cos Φ) is multiplied by an electric power. In this article, we will discuss about basic construction […]

Electrical Transducer

Electrical Transducer There are number of physical or non-electrical quantities which can be measured with the help of electrical or electronic instruments. Transducer plays very important role in industries.  Basically, an instrumentation system consists of three main parts, namely input device, a signal conditioning device and an output device. The output device may be a […]