PDS
TRIAL1: R=100 Ω
L=110mH
C=2.2µF
Frequency
Total Voltage
Total Current
Capacitor
Voltage (VC)
Total
Impedance
(Hz)
(VT)
(IT)
Vrms
mArms
Vrms
(ZT)
F1= 123
4
53.069 mA
4
75.374
173
4
38.519 mA
4
103.845
223
4
26.368 mA
4
151.699
273
4
17.682 mA
4
226.219
323
4
14.618mA
4
273.635
373
4
17.836 mA
4
224.266
423
4
24.000 mA
4
166.667
473
4
30.934 mA
4
129.308
523
4
37.965 mA
4
105.360
573
4
44.913 mA
4
89.061
623
4
51.728 mA
4
77.328
673
4
58.413 mA
4
68.478
723
4
64.971 mA
4
61.566
773
4
71.424 mA
4
56.003
823
4
77.782 mA
4
51.426
847
4
80.805 mA
4
49.502
F2=873
4
84.061 mA
4
47.584
Frequency
(min sa
ammeter)
323
Total
Voltage
Vrms
4
Total
Current
mArms
14.618
Capacitor
Voltage
Vrms
4
Total
impedance
Resonant
frequency
Dynamic
impedance
273.635
289.373
500
SIMULATION (Screenshot)
Circuit Diagram.
Voltage Vs Frequency Showing Fr.
Voltage Vs Freq Showing Cut Off Frequencies.
Ir Vs Frequency
IL Vs Frequency
Ic Vs Frequency
Ir IL Ic It Vs Frequency
SAMPLE COMPUTATION
INTERPRETATION OF RESULT
Since both circuits have a resonant frequency point, the parallel resonance circuit is almost the
same as the series resonance circuit. The experiment comprises parallel resonance and the related
characteristics, which include bandwidth, resonant frequency, quality factor, and cut-off
frequencies. The experiment was done using Ltspice simulation software.
In the Table 7.1, the capacitor voltage and the total circuit voltage are of the same values, which
is 4 𝑉𝑟𝑚𝑠 . A parallel circuit produces a parallel resonance circuit when the resulting current is in
phase with the supply voltage via the parallel combination. The total impedance at resonant
frequency, provided that the total current flow is at its minimum, is equal to the total resistance
connected in the circuit. As the resistance or quality factor decreases the bandwidth increases. If
the inductor reactance increases, the dynamic impedance and resonant frequency decreases.
Table 7.2 uses the given values of components to compute the resonant frequency, cut off
frequencies, bandwidth, and quality factor. It also shows the different values and methods that can
be used for solving the resonant frequency, bandwidth, and quality factor.
CONCLUSION
•
•
•
•
•
One means for a parallel RLC circuit to describe resonance is the frequency at which
impedance is max.
The resonant frequency has had its minimal current.
Total impendance decreases, and total current increases, maintaining a constant voltage
source.
The greater the inductive reactance, the higher the quality factor.
The bigger the bandwidth, the lower the resistance and the quality factor.