Parallel Resonance Flashcards
When frequency decreases, inductive reactance _____ and capacitive reactance ______.
when frequency decreases, inductive reactance decreases and capacitive reactance increases.
The condition in a circuit when inductive reactance equals capacitive reactance is called what?
Resonance
Therefore, a resonant parallel circuit is a parallel LC or LCR circuit where XL equals XC. Any parallel LCR circuit becomes a resonant parallel circuit when the frequency of the applied AC voltage causes XL to equal XC.
As frequency increases, XL_____.
As frequency increases, XC ______.
The only one frequency where XL equals XC is called _______.
As frequency increases, XL increases.
As frequency increases, XC decreases.
The only one frequency where XL equals XC is called resonant frequency.
Resonant frequency is calculated by what formula?
FO = 1 ÷ (2)(pie)[Square root of : (L)(C)]
What is the resonant frequency in this parallel LCR circuit?
fo = 1 ÷ (2)(pie)[sq rt of: (L)(C)]
= 1 ÷ (6.28)[sq rt of: (200µH)(150pF)
= 1 ÷ (6.28)[sq rt of: (.000200)(.000000000150)
= 1 ÷ (6.28)[sq rt of: (.00000000000003)
= 1 ÷ (6.28)(.00000017320508)
= 1 ÷ .00000108772791
= 919,347.56 Hz
= 919 kHz
Circuit characteristics in an LCR circuit changes with ______.
Circuit characteristics in an LCR circuit changes with frequency
The principle characteristic of a parallel LCR circuit is that total impedance is _______ at the resonant frequency.
The principle characteristic of a parallel LCR circuit is that total impedance is MAXIMUM at the resonant frequency.
As frequency increases, total impedance decreases.
As frequency decreases, total impedance decreases.
Total impedance equals the resistance in the circuit.
Circuit current in a parallel LCR circuit at resonance is at a _______.
Circuit current in a parallel LCR circuit at resonance is MINIMUM.
As frequency decreases below resonance, current increases.
As frequency increases above resonance, current increases.
Current equals the applied voltage divided by the resistance only.
The voltage drops across any component in a parallel circuit is (more or less) of the applied voltage.
The voltage drops across any component in a parallel circuit is the same of the applied voltage.
In a parallel LCR circuit, what is the value of total impedance at resonance?
Minimum or Maximum?
Maximum
In a parallel LCR circuit, what is the value of current at resonance?
Minumum or Maximum?
Minimum
In a parallel LCR circuit, what is the value of Er at resonance?
Minimum, Maximum, or Ea?
Ea
LC tank circuits are parallel circuits without ______.
LC tank circuits are parallel circuits without the parallel resistance.
The effect on LC tank circuits values is the same as in ______ circuits.
The effect on LC tank circuits values is the same as in parallel LCR circuits.
When energy is transferred back and forth between the inductor and capacitor, the effect is called _______.
Flywheel
What type of LCR circuit has the capability to become resonant?
Any
