Amps to VA Calculator

Amps to Volt-Amps (VA) Formulas

Single Phase Calculation

The apparent power S in volt-amps is equal to the current I in amps multiplied by the voltage V in volts:

S(VA) = I(A) × V(V)

Where:

  • S(VA): Apparent power in Volt-Amps (VA)
  • I(A): Current in Amperes (A)
  • V(V): Voltage in Volts (V)

This formula is commonly used in electrical engineering to determine the apparent power flowing through a circuit when the current and voltage are known.

Three Phase Calculation

Calculation with Line to Line Voltage

The apparent power S in volt-amps (with balanced loads) is equal to the phase current I in amps multiplied by the square root of 3 times the line to line RMS voltage VL-L in volts:

S(VA) = I(A) × (√3 × VL-L(V))

Where:

  • S(VA): Apparent power in Volt-Amps (VA)
  • I(A): Current in Amperes (A)
  • VL-L(V): Line to line voltage in Volts (V)

This formula is used for three-phase systems where the voltage is measured between two phases.

Calculation with Line to Neutral Voltage

The apparent power S in volt-amps (with balanced loads) is equal to the phase current I in amps multiplied by 3 times the line to neutral RMS voltage VL-N in volts:

S(VA) = I(A) × (3 × VL-N(V))

Where:

  • S(VA): Apparent power in Volt-Amps (VA)
  • I(A): Current in Amperes (A)
  • VL-N(V): Line to neutral voltage in Volts (V)

This formula is particularly useful in systems where the voltage is measured from a phase to the neutral point, such as in residential electrical systems.

Practical Example

For instance, if you have a single-phase system with a current of 10 A and a voltage of 230 V, the apparent power can be calculated as follows:

S(VA) = 10 A × 230 V = 2300 VA

This means that the apparent power flowing through the circuit is approximately 2300 Volt-Amps.

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