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Originally Posted by Diego Dangers.  err. yeah, my bad.
I have no idea where you got that it is never expressed as E. It very much is expressed as E or V. According to my NATEF textbook, thought it may not be about working on aircraft, it is still expressed as E in the 'magic triangle'. Quantity Symbol Unit Sign Voltage V or E volt V Current I ampere (amp) A Resistance R ohm Ω Power P watt W  |
E is short hand for EMF which is Electro Motive Force, an old school way of stating Volts. E=V