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Examoogle • User • info@examoogle.com • EE-2024-8821
Chapter 1 of 12 • Page 1 of 248🔒 Protected PDF • Watermarked
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Unit of active power is
KVA
KVAR
KW
KVAZ
KW
Active power, also known as real power or true power, represents the actual power dissipated by the resistive part of an AC circuit to perform useful work. It is measured in Watts (W), or more commonly in Kilowatts (KW) for industrial and commercial power ratings.
Active power, also known as real power or true power, represents the actual power dissipated by the resistive part of an AC circuit to perform useful work. It is measured in Watts (W), or more commonly in Kilowatts (KW) for industrial and commercial power ratings.
P=VIcosϕ — The fundamental formula for Active Power in a single-phase AC circuit.
P=3VLILcosϕ — The formula for Active Power in a balanced three-phase AC circuit.
In an AC circuit, active power is the product of RMS voltage, RMS current, and the power factor (P=VIcosϕ). Unlike reactive power which oscillates between source and load without doing work, active power is converted into energy forms like heat, mechanical work, or light. The power factor cosϕ accounts for the phase difference between voltage and current waveforms.
Active power is the component of power that performs useful work.
It is measured in Watts (W) or Kilowatts (KW).
It is directly related to the resistive component of the load.
The SI unit for real power is the Watt (W).
Represents real energy consumption
Determines utility billing for consumers
Cannot be measured directly by voltmeters or ammeters alone
Requires power factor consideration
Electrical power grid billing
Energy consumption metrics in appliances
Option A (KVA) represents Apparent Power.
Option B (KVAR) represents Reactive Power.
Option D (KVAZ) is an invalid unit in standard electrical power engineering.
C is correct — The unit of active power is the Watt (W), and for large quantities, Kilowatts (KW) is the standard commercial unit.
Remember the Power Triangle: S2=P2+Q2, where S is Apparent Power (KVA), P is Active Power (KW), and Q is Reactive Power (KVAR).