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Volt-Ampere (VA)

Volt-Ampere (VA)

Measurement unit of apparent power. VA implies the product of volts rms times amps rms. Whenever a power supply output is AC (alternating current), the potential exists for the voltage and current waveforms to be out-of-phase or non-sinusiodal. In these cases, the VA product can be much larger than the real power delivered. In an extreme case, the voltage and current sine waveforms may be 90 degrees out-of-phase. The power supply providing this output is delivering no real output power but could be well over its maximum voltage or current output rating. (077)