How to convert amps to volt-amps (VA)

How to convert amps to VA

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

 

How to convert VA to amps ►

 

See also

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