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Unit of apparent power is
KVA
KVAR
KW
KVAZ
KVA
Apparent power, denoted by S, is the total power delivered to an AC circuit, representing the product of RMS voltage and RMS current. It is measured in Volt-Amperes (VA), or kilovolt-amperes (kVA) for larger quantities, and represents the magnitude of the complex power vector.
Apparent power, denoted by S, is the total power delivered to an AC circuit, representing the product of RMS voltage and RMS current. It is measured in Volt-Amperes (VA), or kilovolt-amperes (kVA) for larger quantities, and represents the magnitude of the complex power vector.
S=VrmsтАЛ├ЧIrmsтАЛ тАФ formula for apparent power
S=P2+Q2тАЛ тАФ relation between apparent, real, and reactive power
In an AC system, not all power is converted into useful work due to phase differences between voltage and current. The apparent power represents the capacity of the system, comprising both active power (which performs work) and reactive power (which maintains magnetic/electric fields). Mathematically, it is the vector sum of real and reactive power.
Apparent power is the product of voltage and current without considering the power factor.
The SI unit is the Volt-Ampere (VA).
kVA is a common commercial unit, where 1┬аkVA=1000┬аVA.
It defines the rating requirement for electrical equipment like transformers and alternators.
Provides a baseline measurement of the total capacity of an electrical system.
Crucial for sizing transformers, cables, and circuit breakers.
Does not represent the actual power converted into useful work.
Inefficient if the power factor is low, leading to higher system losses.
Rating of transformers
Sizing of distribution systems and generators
Option B (kVAR) is the unit of reactive power.
Option C (kW) is the unit of active (real) power.
Option D (kVAZ) is a distractor and not a standard unit.
A is correct тАФ The unit of apparent power in AC circuits is Volt-Ampere (VA), commonly expressed as kVA for large systems.
Remember the Power Triangle: Real power is the base (kW), Reactive power is the height (kVAR), and the Hypotenuse is the Apparent power (kVA).