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
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?
The potential difference across the resistor is 160V and that across the inductor is 120V. Find the effective value of the applied voltage. If the effective current in the circuit be 1.0 A, calculate the total impedance of the circuit.
In a series, LCR circuit, obtain an expression for the resonant frequency,
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.
If an LCR series circuit is connected to an ac source, then at resonance the voltage across ______.
In series combination of R, L and C with an A.C. source at resonance, if R = 20 ohm, then impedence Z of the combination is ______.
At resonance frequency the impedance in series LCR circuit is ______.
The phase diffn b/w the current and voltage at resonance is
A series LCR circuit containing 5.0 H inductor, 80 µF capacitor and 40 Ω resistor is connected to 230 V variable frequency ac source. The angular frequencies of the source at which power transferred to the circuit is half the power at the resonant angular frequency are likely to be ______.
If the rms current in a 50 Hz ac circuit is 5 A, the value of the current 1/300 seconds after its value becomes zero is ______.
