Which unit is used for measuring "reactive" power?

Reactive power is a crucial concept in alternating current (AC) circuits, typically associated with inductive and capacitive components. It is measured in units known as volt-amperes reactive (VAR). Reactive power is essential in maintaining the voltage levels necessary for active power (measured in kilowatts) to be effectively utilized in a circuit.

The correct unit for measuring reactive power is the volt-ampere reactive, commonly abbreviated as VAR. The option mentioning "Kilovolt-amp-reactance" likely confuses reactive power and reactance. While reactance (measured in ohms) refers to the opposition to current flow due to inductive or capacitive effects, it does not directly represent the measure of reactive power. Reactive power itself is the one that flows back and forth between the source and reactive components in the system, which affects the overall efficiency and stability of the electrical network.

Thus, the option that correctly identifies the unit used for measuring reactive power is indeed expressed through the concept of volt-amperes reactive, as this unit encapsulates how these reactive components interact in an AC system. Understanding the role of reactive power is essential for linemen and their work to ensure power quality and system efficiency.