ELEC2134 CH5

¡Supera tus tareas y exámenes ahora con Quizwiz!

Combined Q = w(o)÷BW and Q = Rw(0)C = R/w(0)L we get what? (BW=?)

BW = 1/RC

What happens to the average power P of the resistance at resonance?

The average power dissipated is maximised. Pmax=((Vm/sqrt(2))^2)÷2

What happens to the power at the half-fequencies? wl and wu?

The power will be half of the max power.

Define quality factor (bandwidth).

The quality factor is: w(o):BW or R:L

What can the resonant circuits do (when we relate them to the input V and I) ?

The resonant circuits can generate higher V and I's

What kind of resistor causes a higher quality factor? How does this effect the voltage?

The smaller the resistor, the higher the quality factor and a greater amount of voltage rise during resonance.

What happens to the voltage across the Inductor and Capacitor at resonance, in a series circuit?

They are of equal impedance. VLo = w(0)L/R*Vm VCo = 1/w(o)CR*Vm

What is the resonance frequency also called?

Unity power-factor response

What is the voltage across the: Inductor, (with Q) Capacitor (with Q) in a series circuit at resonance?

VL0 = QVm VC0 = QVm

At resonance the magnitude of: The source voltage The Capacitors Current The Inductors Current is, what, are series resonance?

Vm = Im*r |Ic| = Im*Rw(0)C |Il| = Im*(R/w(0)l)

When does the circuit behave like a resistor?

When the total impedance X = 0, wL = 1/wC V and I are in phase.

When does the circuit behave like an inductor? What is the consequence?

When the total impedance X > 0 wL > 1/wC

When does resonance occur, in electrical circuits?

When the total reactance of the circuit = 0

When does the circuit behave like a capacitor? What is the consequence?

When total impedance X < 0 wL < 1/wC

What is the net reactance when an series RLC circuit is in resonance?

X = wL - 1/wC

What is the impedance of the parallel circuit at resonance frequency?

Y = G + 0B Z = R and ø = 0

What is the total admittance of the RLC circuit?

Y = Yr + Yc +Yl Y = G + jwC + 1÷jwL Y = G + j(wC-1÷wL)

The quality factor selects the _____. If Q is high it has a high _____. If Q is low it has a low _____.

frequency, selectivity, selectivity.

If Q >> 1 then the half frequencies are given by? (fu, fl)

fu ≈ f0 + BW÷2 fl ≈ f0 - BW÷2

If Q > 1 the peak voltage will be _____ than the applied voltage, this is known as _____ voltage rise

greater, resonance

Resonance is always possible in _____ motion

periodic

The w(0) = 1/sqrt(LpC) for a _____ circuit

tuned

What is the Vm(w) = ? or a parallel RLC circuit?

vm(w) = RIm*(1÷sqrt(1+Q^2(w/w(0)-w(0)/w)^2)

A circuit is in resonance when the ____ and ____ at the circuit input terminals are in _____

voltage, current, phase

What is the bandwidth of an RLC series Circuit?

w(H) - w(L)

What is a parallel RLC circuit?

when a current source is in parallel with R, L and C.

What is the resonance frequency?

when w(0) = 1/sqrt(LC) rad/sec

What is the magnitude of Ic and Il are parallel magnitude?

|Il| = |Ic| => Rw(0)C = R/w(o)L

When the coil resistance is small, the Qcoil is _____.

Large.

What is the average power dissipated at the resistance at parallel resonance?

Pmax = (Im/sqrt(2))^2*R = R(Irms)^2

What is the definition of quality factor at parallel resonance?

Q = Rw(o)C = R/w(0)L

What is the quality factor of a series RLC circuit? (Q)

Q = w(0)L/R = 1/w(0)RC

Qcoil is what? in a RLC circuit with a resistance in series with the inducter. A tuned circuit.

Qcoil = w(0)Ls/Rs

Define Resonance

Resonance is the tendency of a system to oscillate at a maximum amplitude at the resonant frequency

Rp = ? Lp = ?

Rp = (Rs^2+w^2Ls^2)÷Rs Lp = (Rs^2+w^2Ls^2)÷Ls Note Xp = wLp

Qcircuit = Rp||R * w(0) * C = ?

Rp||R÷w(0)Lp

What is an RLC circuit?

...-Vm+ -> +R- -> +VL- -> +VC- ->...

What is the upper and lower cut-off frequencies of the RLC series circuit?

1/sqrt(2) * Vm/R

What are the phasor: I, VRo, VLo, VCo or a series circuit in resonance?

I = Vm/R ∠0 VRo = Vm∠0 VLo = QVm∠90 VHo = QVm∠-90

How do we convert a series to parallel?

If we select and R and L, at a given frequency, the admittance can equal the series structure: 1/Rp + 1/jwLp = 1/(Rs+jwLs)

What is the quality factor of a series RLC circuit? (words)

It is the voltage of the inductor and capacitor at resonance.


Conjuntos de estudio relacionados

Circuitory system aids to understandment

View Set

58. Peritoneum - parietal, visceral, peritoneal cavity, omen bursa

View Set

LAB 12: urinalysis lab (urine characteristics and abnormal urinary constitutes)

View Set