Flashcards
AC Circuits
Cards in this deck (33)
- 1How do you calculate the mean value of a periodic signal?
- 2How do you calculate the mean square of a periodic signal?
- 3How do you calculate the root mean square of a periodic signal?
- 4What is the easy way to calculate RMS?
- 5How do you use phasor representation of AC signals?i=Ipcos(wt+ϕ) => I=Ip|ϕ
- 6What is the impedance value of a capacitor?Z = 1/jwC
- 7What is the impedance value of an inductor?Z = jwL
- 8What is the impedance value of a resistor?Z = R
- 9How can impedance be used when working with AC signals?V = Z * I
- 10What form must sinusoidal signals be in before being converted into phasors?They must be in terms of cosine
- 11How to convert from sine to cosine?
- 12What is each part of the impedance called?Z=R+jX
R => resistance, this is the real part
X => reactance, this is the imaginary part - 13What is 1/Z called and what is each part called?Y =1/Z=G+jB
Y => admittance
G => conductance, this is the real part
B => Susceptance, this is the imaginary part - 14How do you combine impedances in parallel?The inverse of the equivalent impedances is equal to the sum of the inverse impedance in parallel
- 15How do you combine impedances in series?The equivalent impedance is equal to the sum of the impedances in series,
- 16How do you do a Thevenin or Norton equivalent circuit when working with AC?First convert all elements into impedances, then complete as normal
- 17How does mesh analysis work with AC?Exactly the same as DC but you create an impedance matrix rather than a resistance matrix
- 18How does mesh analysis work with AC?Exactly the same as DC but you create an admittance matrix rather than a conductance
- 19Average power in AC circuits? (integral)
- 20Average power in AC circuits? (RMS)
- 21In a resistor what does the power factor equal?cosθ = 1
As the current and voltage are in phase - 22In a capacitor and inductor what does the power factor equal?cosθ = 0
As the current and voltage are 90° out of phase - 23Reactive power in AC circuits?
- 24Complex power in AC circuits?
- 25Apparent power in AC circuits?
- 26How do you calculate complex power in an AC circuit?
- 27What are the three interpretations of θ in power factor?1. Phase difference between voltage and current
2. Angle of the complex power
3. Angle of the impedance - 28When does maximum power transfer occur in an AC circuit?When the load impedance is equal to the complex conjugate of the source impedance
- 29What is the equation to calculate maximum power transfer?
- 30How to calculate the load values for maximum power transfer with constraints?
- 31What is a matching network?A non-dissipative network, meaning it only contains capacitors and inductors, used to maximise power transfer from source to load
- 32What combination of inductors and capacitors are required in a matching network?If only the imaginary part requires matching an impedance in series with the load is required
If both the real and the imaginary part require matching an impedance in parallel with the load and another in series with the load is needed - 33How to remember if the current lags or leads the voltage in an inductor or capacitor?CIVIL
CIV = In a capacitor current leads voltage
VIL = In an inductor current lags voltage
Information
- Description
- Engineering (16ELA001 - Circuits) Flashcards on AC Circuits, created by Ben Evans on 10/04/2017.
- Created by
- Ben Evans
- Views
- 5
- Rating