List out any four effects of electric current used in measuring instruments & write name of meter working on it.
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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.

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