AC sources use the peak value instead of the effective RMS value. This may be ok for a sine wave generator, but not for an AC source. For example, one may place an AC voltage source of 230 V and 50 (or 60) Hz, expecting the same behavior of a common power plug, but instead getting a 163 Vrms source.
A possible solution is to use suffixes after the V and A units:
1 V = 1 Vrms = 1.41 Vp = 2.82 Vpp
1 A = 1 Arms = 1.41 Ap = 2.82 App
(I suggest aliasing V to Vrms since it's the most common one (power dissipation on a resistor is P = Irms^2*R = Vrms^2/R), but maybe it should be aliased to Vp instead for backward compatibility)
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