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Energy metre has ________ terminals.
2
3
4
6
4
A standard single-phase induction-type energy meter is designed with four terminals to connect the supply and the load. These terminals are provided to facilitate the connection of both the current coil (in series) and the pressure coil (in parallel) to the incoming supply and the outgoing load circuits.
A standard single-phase induction-type energy meter is designed with four terminals to connect the supply and the load. These terminals are provided to facilitate the connection of both the current coil (in series) and the pressure coil (in parallel) to the incoming supply and the outgoing load circuits.
E=тИлVтЛЕIтЛЕcos(╧Х)dt тАФ Energy measured by the meter
TdтАЛтИЭ╬жpтАЛтЛЕ╬жsтАЛтЛЕsin(╬▒) тАФ Driving torque in induction meter
The four terminals are usually arranged as follows: two for the input (Line and Neutral from the source) and two for the output (Line and Neutral going to the load). Terminals 1 and 2 are typically used for the incoming supply line and neutral, while terminals 3 and 4 are used for the load-side line and neutral. This configuration ensures the current coil senses the load current (ILтАЛ) and the pressure coil senses the supply voltage (VSтАЛ), allowing the meter to compute energy (E=тИлVтЛЕIтЛЕcos(╧Х)dt).
Terminals 1 & 2 are for incoming line and neutral.
Terminals 3 & 4 are for outgoing load connections.
The pressure coil is connected in parallel to the supply across two terminals.
The current coil is connected in series with the load path.
Easier installation for residential circuits
Clear separation of incoming and outgoing supply wires
Limited to single-phase systems
Tampering at terminal block is possible if not sealed
Domestic electricity billing
Single-phase electrical distribution systems
For three-phase systems, the number of terminals increases significantly (usually 6, 8, or more) to accommodate three phases and the neutral wire.
Option B (3) is incorrect because there is no standard configuration for a 3-terminal AC energy meter.
C is correct тАФ An energy meter for single-phase residential use is equipped with 4 terminals to accommodate line and neutral connections for both input and output.
In competitive exams, always differentiate between single-phase (4 terminals) and three-phase meter connections; the latter requires additional terminals for PT (Potential Transformer) and CT (Current Transformer) inputs if applicable.