number of terminals present on single phase energy terminals
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A energy meter usually has four terminals. A pair of terminals for the current coil and another pair for the Voltage coil (a.k.a pressure coil). As their name suggests, current coil is in series with the line and or produces magnetic field according to the current flow.
Whereas Voltage coil is in parallel with the Load and it produces magnetic field according to the voltage drop across the Load.
These two fields combine to produce a torque which rotates the aluminum disc on a conventional Energy meter
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