Term
What is the equation for inductive reactance? X_{L} 

Definition


Term
What is the equation for capacitive reactance? 

Definition


Term
Describe the relationship between voltage and current in an inductuve circuit. 

Definition
Voltage leads current by 90 degrees in an inductive circuit. (ELI the ICEman) 


Term
What is the equation for impedance in and RL circuit. 

Definition


Term
What is the equation for resonance frequency? (F_{res}) 

Definition


Term
What is the equation for impedance in a series RCL circuit? 

Definition
Z = √[R^{2}+(X_{c}+X_{L})^{2}] 


Term
What is the equation for impedance for a parallel RCL circuit? 

Definition
Z_{T}=V_{T}/I_{T} I_{T}=√(I_{R}^{2}+(I_{L}I_{C})^{2}) 


Term
Given a parallel RCL circuit at resonance, DESCRIBE the net reactance of the circuit. 

Definition
Net Reactance (X) is at zero and the series resistance of the circuit determines circuit current output. 


Term
Describe the characteristics of inductors when they are placed in and AC circuit. 

Definition
Because of a constantly changing current, a constantly changing EMF is produced. Becuase this EMF flows in a direction opposite the normal current it is measured in ohms.The value of the self induced EMF varies as a sine wave and lags the current by 90^{0}. 


Term
19. Given a parallel RCL circuit at resonance, DESCRIBE the circuit output relative to current. 

Definition
Net Reactance (X) is at MAXIMUM and circuit current output is minimum. 


Term
Given an AC singlephase or threephase circuit, describe the characteristics of the power generated in the circuit. 

Definition
AC power components are not in phase and as a result not all power can be used to perform work. Reactive power must be considered and removes some of the apparent power. The remaining power is true power and is the only component that may be used in real work. 


Term
 Describe the relationship between apparent, true (real), and reactive power using a power triangle.


Definition
Apparent power (generator output) is the hypotenuses. True power (WATTS) is adjacent to the hypotenuse and forms angle θ. Reactive power (VARS) is the opposite angle from 


Term
Define leading power factor 

Definition
Power factor associated with capacitive circuits (ice man in eli the ice man) 


Term
Define lagging power factor. 

Definition
Power factor associated with inductive circuits 


Term
 State the reason three phase systems are used in the industry.


Definition

 Threephase circuits weigh less than singlephase circuits of the same power rating.
 They have a wide range of voltages and can be used for singlephase loads.
 Threephase equipment is smaller in size, weighs less, and is more efficient than singlephase equipment.



Term
What is the equation for true power? 

Definition


Term
What is the equation for reactive power? 

Definition


Term
What is the equation for apparant power? 

Definition


Term
What is the equation for power factor? 

Definition


Term
State the indications of an unbalanced load in a threephase power system 

Definition
Unbalanced threephase circuits are indicated by abnormally high currents in one or more of the phases 

