VA's are VA's. VA in equals VA out.
For the purposes of the technician in the field, just remember the VA's going into a transformer are equal the VA's coming out.
For example: How much current does a standard 40 VA transformer pull? How much current does it provide? The primary voltage is 120 and the secondary voltage of a standard air conditioner transformer is 24 volts, and the rated output is 40 VA.
Then the primary amperage is 0.33 amps (120V times 0.33A = 40VA) and the secondary amperage is 1.75 amps (24V times 1.75A = 40VA).
Yes, the term 'VA' stands for Volts times Amps. Volts multiplied by Amps is also the classic definition of a Watt.
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