Electric current in amps (A) to apparent power in volt-amps (VA).
You can calculate volt-amps from amps and volts, but you can't convert amps to volt-amps since volt-amps and amps units do not measure the same quantity.
Single phase amps to VA calculation formula
The apparent power S in volt-amps (VA) is equal to current I in amps (A), times the RMS voltage V in volts (V):
S(VA) = I(A) × V(V)
So volt-amps are equal to amps times volts:
volt-amps = amps × volts
or
VA = A ⋅ V
Example
What is the apparent power in VA when the current is 12A and the voltage supply is 110V?
Solution:
S = 12A × 110V = 1320VA
3 phase amps to VA calculation formula
The apparent power S in volt-amps (VA) is equal to square root of 3 times current I in amps (A), times the line to line RMS voltage VL-L in volts (V):
S(VA) = √3 × I(A) × VL-L(V)
So volt-amps are equal to square root of 3 times amps times volts:
kilovolt-amps = √3 × amps × volts
or
kVA = √3 × A ⋅ V
Example
What is the apparent power in VA when the current is 12A and the voltage supply is 110V?
Solution:
S = √3 × 12A × 110V = 2286VA
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