Advertisements
Advertisements
प्रश्न
In a series LCR circuit, VL = VC ≠ VR. What is the value of power factor?
Advertisements
उत्तर
In an LCR series circuit, power dissipated is given by
P = I2ZcosΦ
`P/(I^2sqrt(R^2+(X_C-X_L)^2))=cosphi`
The quantity cosΦ is the power factor.
`cosphi=P/(I^2sqrt(R^2+(X_C-X_L)^2))`
∵ VL=VC and XL= XC
`:.cosphi=P/(I^2R)`
APPEARS IN
संबंधित प्रश्न
A coil of resistance 40 Ω is connected across a 4.0 V battery. 0.10 s after the battery is connected, the current in the coil is 63 mA. Find the inductance of the coil.
In a series, LCR circuit, obtain an expression for the resonant frequency.
If an LCR series circuit is connected to an ac source, then at resonance the voltage across ______.
Which of the following components of an LCR circuit, with a.c. supply, dissipates energy?
Which of the following combinations should be selected for better tuning of an LCR circuit used for communication?
A coil of 0.01 henry inductance and 1 ohm resistance is connected to 200 volt, 50 Hz ac supply. Find the impedance of the circuit and time lag between max. alternating voltage and current.
When an alternating voltage of 220V is applied across device X, a current of 0.25A flows which lags behind the applied voltage in phase by π/2 radian. If the same voltage is applied across another device Y, the same current flows but now it is in phase with the applied voltage.
- Name the devices X and Y.
- Calculate the current flowing in the circuit when the same voltage is applied across the series combination of X and Y.
A series LCR circuit is connected to an ac source. Using the phasor diagram, derive the expression for the impedance of the circuit.
What constitutes a series LCR circuit?
Which expression gives the sinusoidally varying voltage applied by the AC source?
