Verified Answer :

A.C: It is the abbreviation of Alternating Current

AL2006


You have several electrical units listed there:

a).  C often used to represent a Capacitance.

b).  'A' often represents 'Ampere', the unit of Current.

c).  'R' often used to represent a Resistance.

d).  'E' often used to represent a Voltage (Electromotive Force).

Not to mention ' A. C ', a whimsical offering,
reminiscent of 'Alternating Current'.