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 1

What is the apparent power in VA when the current is 12A and the voltage supply is 120V?

Solution:

S = 12A × 120V = 1440VA

Example 2

What is the apparent power in VA when the current is 12A and the voltage supply is 190V?

Solution:

S = 12A × 190V = 2280VA

Example 3

What is the apparent power in VA when the current is 12A and the voltage supply is 220V?

Solution:

S = 12A × 220V = 2640VA

3 phase amps to VA calculation formula

So 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 1

What is the apparent power in VA when the current is 12A and the voltage supply is 120V?

Solution:

S = 3 × 12A × 120V = 2494VA

Example 2

What is the apparent power in VA when the current is 12A and the voltage supply is 190V?

Solution:

S = 3 × 12A × 190V = 3949VA

Example 3

What is the apparent power in VA when the current is 12A and the voltage supply is 220V?

Solution:

S = 3 × 12A × 220V = 4572VA

 

 

How to convert VA to amps ►

 


See also

FAQ

How many VA are in a amp?

An ampere is the unit of electric current, which is the number of electrons flowing through a circuit. An ampere is a current generated by a force of 1 V acting through a resistance of 1 ohm (Ω).

How do you calculate VA volt-amps?

It's important to note that calculations vary between single and three phase power, so you need to know which one you have.

Single Phase Equation.

VA = Volts X Amps

kVA = Volts x Amps / 1000

Three Phase Equation. For three-phase, you multiply the square root of 3 (√3) or 1.732 by the line-to-line voltage by the amps.

VA = √3 x Volts x Amps

kVA = √3 x Volts x Amps / 1000

Example

single phase. What is the VA of a 120VAC single phase load that draws 12 amps?

volts = 120

amps = 12

KVA = Volts X Amps = 120 X 12 = 2400VA

 

three phase. What is the KVA of a 480VAC three phase load that draws 86 amperes?

Voltage Line to Line = 480

amps = 86

kVA = √3 x Volts x Amps / 1000 = 1.732 x 480 x 86/1000 = 71.5 kVA

How is VA calculated?

VA = VRMS x IRMS (4)

You can calculate the apparent power in volt-amperes for an AC circuit by multiplying the measured RMS voltage by the measured RMS current.

How many amps can a 100 VA transformer handle?

10 amperes
For example, a transformer with a 100 VA rating can handle 100 volts at one ampere (amp) of current. The kVA unit represents kilovolt-ampere or 1,000 volt-ampere. A transformer with a 1.0 kVA rating is the same as a transformer with a 1,000 VA rating and can handle 100 volts at 10 amps of current.

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