List out any four effects of electric current used in measuring instruments & write name of meter working on it.
Effects of Electric Current used in measuring instruments:
1. Magnetic Effect: PMMC and Moving Iron type Ammeters, voltmeter and Dynamometer type wattmeters etc.
2. Electromagnetic induction effect: Induction type Ammeters, voltmeters, wattmeters, energy meters etc.
3. Heating effect: Hot wire instruments - Ammeters, voltmeter
4. Electrostatic effect: Voltmeters.
5. Hall Effect: Flux meter, Poynting vector wattmeter.