Volt-amperes (VA) are a unit of measurement used to express the apparent power in an electrical circuit. This measurement combines both voltage (measured in volts) and current (measured in amperes) to indicate how much power is being used or generated. Unlike watts, which measure real power, volt-amperes account for both active and reactive power in alternating current (AC) systems. In practical terms, volt-amperes help determine the capacity of electrical equipment, such as transformers and generators. Understanding VA is essential for ensuring that devices operate efficiently and safely without overloading the electrical system.