What units does an energy meter record in?

An energy meter records the volume of electrical energy consumed in units of kilowatt-hours or kWh.

Is there a difference between analog and digital energy meters?

Yes, analog meters have a mechanical display using dials whereas digital meters have an electronic LCD/LED display for readings.

What is the basic working principle of energy meters?

Energy meters work on the principle of electro-magnetic induction. Interaction between magnetic fields generated from current and voltage coils rotates the aluminum disc, which is then registered to indicate energy consumed.

What are current transformers and why are they used?

Current transformers are used in three-phase energy meters to step down high load currents to safe levels before supplying them to the meter for measurement. This provides protection and safety.

Besides household billing, what other applications do energy meters have?

Energy meters also find applications in industrial/commercial audits, substation monitoring, distributed renewable plant output recording, and load research for management and planning.