Single phase VA to amps calculation formula
I(A) = S(VA) / V(V)
The current I in amps (A) is equal to the apparent power S in volt-amps (VA), divided by the voltage V in volts (V).
So,
A = VA / V
amp = volt-amp / volt
For example:
Power (S) = 4500VA
Voltage (V) = 110V
Current (I) = 4500VA / 110V = 40,91A
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Three phase VA to amps calculation formula
I(A) = S(VA) / (√3 × VL-L(V))
The current I in amps (A) is equal to the apparent power S in volt-amps (VA), divided by the square root of 3, multiplied by the line to line voltage VVL-L in volts (V).
So,
A = VA / (√3 × V)
amp = volt-amp / (√3 × volt)
For example:
Power (S) = 4500VA
Voltage (V) = 110V
Current (I) = 4500VA / (√3 × 110V) = 23,62A
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