Do you mean 'megavolt ampere' (MV.A) or 'millivolt ampere' (mV.A)? By using the incorrect symbol ('mva'), this is not clear.
To determine the apparent power, in volt amperes, you divide the true power, in watts, by the power factor of the load. One volt ampere is one-millionth of a megavolt ampere ('MV.A' -not 'mva') -assuming you don't mean 'millivolt ampere' ('mV.A')!
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MVA is the apparent power. MVA=( MW+ MVAr)1/2
In electrical engineering it can be millivolt amperes, unless it's MVA then it is megavolt amperes. Such as in the use of large transformers.
MVA= square root of (MW2 + MVAR2 )
How much current? Volts/Amps = Ohms. In your case Volts = 1.5
P = V x A, POWER (watts) = VOLTS times AMPS But 1.5V AC is not a normal output