How to convert VA to amps

Apparent power in volt-amps (VA) to electric current in amps (A).

You can calculate amps from volt-amps and volts, but you can't convert volt-amps to amps since volt-amps and amps units do not measure the same quantity.

Single phase VA to amps calculation formula

The current I in amps is equal to the apparent power S in volt-amps (VA), divided by the RMS voltage V in volts (V):

I(A) = S(VA) / V(V)

So amps are equal to volt-amps divided by volts.

amps = VA / volts

or

A = VA / V

Example

Question: What is the current in amps when the apparent power is 3000 VA and the voltage supply is 110 volts?

Solution:

I = 3000VA / 110V = 27.27A

3 phase VA to amps calculation formula

The current I in amps is equal to the apparent power S in volt-amps (VA), divided by the square root of 3 times the line to line voltage VL-L in volts (V):

I(A) = S(VA) / (3 × VL-L(V) )

So amps are equal to volt-amps divided by the square root of 3 times volts.

amps = VA / (3 × volts)

or

A = VA / (3 × V)

Example

Question: What is the current in amps when the apparent power is 3000 VA and the voltage supply is 110 volts?

Solution:

I = 3000VA / (3 × 110V) = 15.746A

Ampere definition

Ampere or amp (symbol: A) is the unit of electrical current.

The Ampere unit is named after Andre-Marie Ampere, from France.

One Ampere is defined as the current that flows with electric charge of one Coulomb per second.

1 A = 1 C/s

Volt-ampere (VA) definition

A volt-ampere (SI symbol: V⋅A or V A; also VA) is the unit used for the apparent power in an electrical circuit. The apparent power equals the product of root mean square voltage and root mean square current. In direct current (DC) circuits, this product is equal to the real power in watts. Volt-amperes are usually used for analyzing alternating current (AC) circuits. The volt-ampere is dimensionally equivalent to the watt (in SI units, 1 V⋅A = 1 W). VA rating is most useful in rating wires and switches (and other power handling equipment) for inductive loads

For a simple electrical circuit running on direct current, the electrical current and voltage are constant. In that case, the real power (P, measured in watts) is the product of the electrical current (I, measured in amperes) and the voltage from one side of the circuit to the other (V, measured in volts):

P = I × V

However, for alternating current, both the voltage and current fluctuate over time. The apparent power (S, measured in volt-amperes) is calculated using the root mean square voltage (Vrms, measured in volts) and root mean square current (Irms measured in amps):

S = Irms × Vrms 


How to convert amps to VA »


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