In a single phase energy meter, the series electromagnet is energized by a ___ of ___

• A. voltage coil, thick wire of few turns
• B. voltage coil, thin wire of more turns
• C. current coil, thin wire of more turns
• D. current coil, thick wire of few turns

Answer: (D)

The series electromagnet is energized by a coil known as current coil which is connected in series with the load so that it carry the load current.
The flux produced by this magnet is proportional to and in phase with the load current.