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How to Convert kVA Into Primary Amps

Power measurement in an AC circuit is more complicated than in a DC circuit. AC circuits usually have inductors and capacitors, both of which create lag in voltage and current. This reduces the usefulness of the standard power equation of VI = W, because you have to factor in the impedance of the circuit. Apparent power, which factors in impedance, is measured in VA, or volt-amperes. High-power devices, which have higher voltages, use kVA, or kilovolt-amperes. If you know this measurement, you can determine the standard current in amperes.

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Instructions

- 1
  Determine whether the circuit is single-phase or three-phase. If you're working with a device such as a motor, this information will be listed on the nameplate. If you're solving an electrical equation, this information will likely exist in the information for the problem.
- 2
  Multiply kVA by 1,000 to convert to VA, or volt-amperes. For example, 0.2 kVA converts to 200 VA.
- 3
  Divide VA by the voltage to determine the current. If you have a 200 VA single-phase motor connected to a 100-volt power supply, it has a 2-ampere current.
- 4
  Divide VA by 1.73 times voltage when working with three-phase circuits. A 200 VA three-phase motor, when connected to a 100-volt power supply carries 1.15 amperes of current.

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