Owen Duffy wrote:
"Leaving aside your new confusing term "effective value", if you
multiply Vrms by Irms in an AC circuit you get Apparent Power (units
are volt amps or VA."

Exactly, except the term "effective value is as old as a-c power
calculations. The value of the a-c volt was chosen to produce the same
effect, lamps as bright, heat as warm, as d-c does.

My electronic dictionary says:
"rms amplitude - Root-mean-square amplitude, also called effective
amplitude. The value assigned to an alternating current or voltage that
results in the same power dissipation in a given resistance as dc
current or voltage of the same numerical value.'

Best regards, Richard Harrison, KB5WZI