Different Types of Measurements Instruments According to Principle of Working

Different Types of Measuring Instruments According to Principle of Working

The principle of working of all measuring instruments depends upon the various effects of electric current or voltage. The instruments generally classified according to effects utilized in their operation is given below in table

S.No	Effect	Type of Instrument	Suitable for Supply	Instrument utilising the effect
1	Magnetic effect	Moving-iron type	d.c. and a.c.	Ammeter, Voltmeter
2	Electrodynamic  effect	Permanent moving coil type and dynamo-meter	d.c. only , d.c. and a.c.	Ammeter, voltmeter and Ammeter, voltmeter, wattmeter
3	Electro-magnetic induction effect	Induction type	a.c. only	Ammeter, voltmeter, wattmeter, energy meter
4	Thermal effect	Hot-wire type	d.c. and a.c.	Ammeter, voltmeter
5	Chemical effect	Electrolytic meter type	d.c. only	Ampere-hour meter
6	Electrostatic effect	Electrostatic type	d.c. and a.c.	Voltmeters only

The above table represents the different types of instruments according to principle of working.