मराठी

Define 'Quality Factor' of Resonance in a Series Lcr Circuit. What is Its Si Unit? - Physics

Advertisements
Advertisements

प्रश्न

Define 'quality factor' of resonance in a series LCR circuit. What is its SI unit?

Advertisements

उत्तर

The ratio `(omega_0L)/R`is called the quality factor or Q-factor.

`Q= (omega_0L)/R`

It is a dimensionless quantity.

shaalaa.com
  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
2015-2016 (March) Delhi Set 1

व्हिडिओ ट्यूटोरियलVIEW ALL [2]

संबंधित प्रश्‍न

A voltage V = V0 sin ωt is applied to a series LCR circuit. Derive the expression for the average power dissipated over a cycle. Under what condition (i) no power is dissipated even though the current flows through the circuit, (ii) maximum power is dissipated in the circuit?


The magnetic field at a point inside a 2.0 mH inductor-coil becomes 0.80 of its maximum value in 20 µs when the inductor is joined to a battery. Find the resistance of the circuit.


The current in a discharging LR circuit without the battery drops from 2.0 A to 1.0 A in 0.10 s. (a) Find the time constant of the circuit. (b) If the inductance of the circuit 4.0 H, what is its resistance?


Answer the following question.
Draw the diagram of a device that is used to decrease high ac voltage into a low ac voltage and state its working principle. Write four sources of energy loss in this device.  


In a series LCR circuit the voltage across an inductor, capacitor and resistor are 20 V, 20 V and 40 V respectively. The phase difference between the applied voltage and the current in the circuit is ______.


A series LCR circuit containing a 5.0 H inductor, 80 µF capacitors, and 40 Ω resistor is connected to a 230 V variable frequency ac source. The angular frequencies of the source at which power is transferred to the circuit are half the power at the resonant angular frequency are likely to be ______.


Consider the LCR circuit shown in figure. Find the net current i and the phase of i. Show that i = v/Z`. Find the impedance Z for this circuit.


For an LCR circuit driven at frequency ω, the equation reads

`L (di)/(dt) + Ri + q/C = v_i = v_m` sin ωt

  1. Multiply the equation by i and simplify where possible.
  2. Interpret each term physically.
  3. Cast the equation in the form of a conservation of energy statement.
  4. Integrate the equation over one cycle to find that the phase difference between v and i must be acute.

Draw the phasor diagram for a series LRC circuit connected to an AC source.


To reduce the resonant frequency in an L-C-R series circuit with a generator ______.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×