Draw a neat sketch of 1-ph induction type energy meter and write operating principle of it. 
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Operating Principal:- The disc is placed between the two-flux due to pressure coil and flux due to current coil, which will set up torque on the disc which is proportional to power causing the disc to rotate. As shown in the diagram electromagnets, eddy currents will be induced on the disc by two fluxes 

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An aluminum disc is placed inside a magnetic core with two limbs. One carries a voltage coil so its flux is proportional to voltage, the second carries a current coil so its flux is proportional to current.

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