What Are Volt-Amperes?

Volt-ampere is a unit of electrical measurement that is equal to the product of one unit of volts and one unit of amperes. It is used as a measure of power in direct current and as a measure of power in alternating current.

Power and

There are three situations:

(1) The power of generators, transformers and other equipment is called apparent power:

Where S

Volt-ampere is the unit of "apparent power", and its value is the product of voltage and current, and watt is the unit of "active power". In a DC circuit or a purely resistive AC load, the two values are equal. In AC circuits, the two are generally not equal, W (watt) = VA (volt-ampere) × cos, cos is the power factor, except for pure resistance load, cos is generally less than 1. Due to the presence of inductive and capacitive loads, the current has a leading and lagging relationship with respect to the voltage. is the phase difference between voltage and current.

Volt-ampere is the capacity unit of electrical appliances. It is for electrical appliances that have voltage and current but do not perform work. Watt is the power unit of electrical appliances. It is for electrical appliances that have voltage and current and do work.