AC Power Flashcards
What type of electric current is generated by the majority of power plants?
Alternating current (AC)
AC is used by most power distribution systems.
What are the three kinds of power in AC circuits?
- Real power
- Reactive power
- Apparent power
Each type of power serves a different purpose in AC circuits.
The quantity of power that is dissipated or that does productive work in the circuitDefine real power in the context of AC circuits.
real power
Also known as genuine or active power.
What is the unit of measurement for real power?
Watts (W)
Real power is measured in watts.
A form of electrical power essential for maintaining the electrical or magnetic field in an AC circuit
reactive power
It does not contribute to useful work.
What is the unit of measurement for reactive power?
Volt-Ampere Reactive (VAR)
Reactive power is measured in VAR.
The combination of real power and reactive power
apparent power
It represents the total power in the circuit.
What is the unit of measurement for apparent power?
Volt-Ampere (VA)
Apparent power is measured in volt-amperes.
Fill in the blank: Apparent power is the combination of _______ and _______.
real power; reactive power
This relationship is fundamental in understanding AC circuits.
What formula is used to express apparent power?
S = VTI
Where S is apparent power, V is voltage, and I is current.
when the voltage ad the current are in phase
unity power factor
when the current lags the voltage by an acute angle
lagging power factor
when the current leads the voltage by an acute angle
leading power factor
when the voltage and current are out-of-phase by exactly 90degree
zero power factor
it brings the power factor of an AC power circuit closer to 1 by supplying reactive power of opposite sign
power factor correction
