Most common form of

The correct answer is D. all of the above.

Mercury motor meters, commutator motor meters, and induction type single phase energy meters are all common forms of A.C. meters met with in every day domestic and industrial installations.

Mercury motor meters are the oldest type of A.C. meter and are still used in some applications. They work by using the rotation of a mercury-filled rotor to generate an electric current that is proportional to the amount of current flowing through the meter.

Commutator motor meters are a more modern type of A.C. meter that uses a rotating commutator to generate an electric current

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