1.
When two loops with or without contacts between them affect eachother through the magnetic field generated by one of them, they aresaid to be magnetically coupled.
2.
The resonant circuit consists only of a capacitor with a voltage or current source.
3.
This curve is for bandstop filter
4.
The resonant circuit consists only of inductor with a voltage or current source.
5.
This curve indicates that power willbe a maximum at fr and varying thefrequency in either direction resultsin a rise of the power.
6.
The value of ω that satisfies this condition is called the resonant frequency
7.
The bandwidth is the average between the half power points on the response curve of the filter.
8.
The total impedance of RLC parallel circuit is given in the shown relation
9.
The phase of The current across coil in series resonant circuit is +90 when the supply is 5Sinωt
10.
In RLC series resonance the Magnitude of inductive reactance must Eliminates the Magnitude of capacitive reactance to result a pure inductor
11.
Since the current is maximum at resonance,it follows that the power must similarly be maximum at resonance.
12.
The power response of a series resonant circuit has a bell-shaped curve called the selectivity curve.
13.
If the bandwidth of a circuit is kept very narrow , the circuit is said to have a Low selectivity
14.
The Bandwidth of the resonant circuit (BW) is The difference between the frequencies at which the circuit delivers half of the maximum power.
15.
The resonant frequency is the geometric mean of the half-power frequencies. The resonant frequency is the geometric sum of the half-power frequencies.
16.
The “sharpness” of the resonance in a resonant circuit is measured quantitatively by the quality factor Q.
17.
The quality factor of resonance circuit doesn't depent on resistance
18.
In series resonance, The higher the value of Q , the more selective the circuit is but more
bandwidth.
19.
In series resonance, If the band of frequencies to be selected or rejected is narrow,
the quality factor of the resonant circuit must be high.
20.
At parallel resonance, the admittance consists only conductance G = 1/2R.
21.
At parallel resonance,The value of current will be minimum since the total admittance is maximun
22.
At parallel resonance,The Power factor is unity.
23.
At parallel resonance, The currents through the inductor and
the capacitor have the same
magnitudes but are 90 out of phase.
24.
The magnitude of current in the reactive elements at parallel resonance is Q times Lower than the applied source current.
25.
In practical parallel resonance , if the internal resistance of the coil is negligable , so the resonance frequency of the circuit will be equal to the resonant frequency of ideal parallel resonance