# What does it mean when an RLC circuit is at resonance?

It means that the capacitive reactance and the inductive reactance are equal in magnitude but nullify the effect of each other, as they oppose each other. In this condition the impedance of the network would be equal to the resistance.

When the total impendance equals  supply frequency.
Means?

## Related questions

Description : In parallel RLC resonance circuit at resonance the current will be  (1) Minimum (2) Maximum (3) Zero (4) Infinite

Answer : In parallel RLC resonance circuit at resonance the current will be Minimum

Description : Magnitude of current at resonance in R-L-C circuit?

Answer : The current will be maximum if it is a series rlc circuit.

Description : The power factor at resonance in R-L- C parallel circuit is?

Answer : since a rlc circuit at resonance behaves like a pure resistive circuit, i.e there is no phase difference between current and voltage, hence the power factor is unity.

Description : In a series RLC high Q circuit, the current peaks at a frequency  (1) equal to the resonant frequency (2) greater than the resonant frequency (3) less than the resonant frequency (4) equal to half the resonant frequency

Answer : In a series RLC high Q circuit, the current peaks at a frequency equal to the resonant frequency

Description : In an ac series RLC circuit, the voltage across R and L is 20 V; voltage across L and C is 9 V and voltage across RLC is 15 V. What is the voltage across C?

Answer : In an ac series RLC circuit, the voltage across R and L is 20 V; voltage across L and C is 9 V and voltage across RLC is 15 V. What is the voltage across C? 7 V

Description : In R-L-C series resonant circuit magnitude of resonance frequency can be changed by changing the value of?

Answer : In R-L-C series resonant circuit magnitude of resonance frequency can be changed by changing the value of L or C.

Description : A parallel RLC circuit has the node equation Determine v(t) using the phasor method.

Answer : A parallel RLC circuit has the node equation Determine v(t) using the phasor method.

Description : The loop equation for a series RLC circuit gives

Answer : The loop equation for a series RLC circuit gives

Description : A DC voltage source is connected across a series RLC circuit. Under steady-state conditions, the applied DC voltage drops entirely across the

Answer : A DC voltage source is connected across a series RLC circuit. Under steady-state conditions, the applied DC voltage drops entirely across the C only

Description : In a R-L-C circuit?

Answer : In a R-L-C circuit power is consumed in resistance and is equal to I R, exchange of power takes place between inductor and supply line, exchange of power takes place between capacitor and supply line, exchange of power does not take place between resistance and the supply line.

Description : In a loss-free R-L-C circuit the transient current is?

Answer : In a loss-free R-L-C circuit the transient current is sinusoidal.

Description : What does it mean to analyze a circuit?

Description : A universal RLC bridge uses?

Answer : A universal RLC bridge uses Maxwell Wein bridge for measurement of inductance and modified De Santy's bridge for measurement of capacitance.

Answer : In an RLC parallel circuit, the impedance at resonance is Maximum.

Description : Resonance occurs in RLC series circuit when  A) When the supply voltage and current are in phase B) When inductive reactance become equal to capacitive reactance C) When voltage across the inductor become equal to the voltage across the capacitor D) All of the above

Description : In a circuit containing R, L and C, power loss can take place in?

Answer : In a circuit containing R, L and C, power loss can take place in R only.

Description : In a series RLC circuit at resonance, which of the following quantities attains maximum value ? (A) Current (B) Voltage (C) Power (D) None of the above

Description : The series and parallel resonance on L-C circuit differs in that?

Answer : The series and parallel resonance on L-C circuit differs in that series resistance needs a low-resistance source for sharp rise in current.

Description : A parallel AC. circuit in resonance will?

Answer : A parallel AC. circuit in resonance will have a high impedance.

Description : The purpose of a parallel circuit resonance is to magnify?

Answer : The purpose of a parallel circuit resonance is to magnify voltage.

Description : In a series RLC circuit at resonance, the magnitude of the voltage developed across the capacitor  A) Is always zero B) Can never be greater than the input voltage C) Can be greater than the input ... input voltage D) Can be greater than the input voltage, and is in phase with the input voltage

Answer : In a series RLC circuit at resonance, the magnitude of the voltage developed across the capacitor Can be greater than the input voltage, however, it is 90° out of phase with the input voltage

Description : Consider the following statements with respect to a high Q, series RLC circuit under resonance 1. The voltage across R is equal to the applied voltage 2. The voltage across L and C are zero 3 ... in magnitude 4. The voltage accross L and C are maximum Which of these statements are correct?

Answer : Consider the following statements with respect to a high Q, series RLC circuit under resonance 1. The voltage across R is equal to the applied voltage 2. The voltage across L and C are zero 3. ... The voltage accross L and C are maximum Which of these statements are correct? 1,3 and 4

Description : Power factor of an inductive circuit is usually improved by connecting capacitor to it in?

Answer : Power factor of an inductive circuit is usually improved by connecting capacitor to it in parallel.

Description : In a 3-phase converter circuit during commutation when one SCR in one phase is turned on to turn-off an SCR in another phase, results in (A) voltage notching (B) harmonic distortion (C) voltage sag (D) voltage swell

Answer : In a 3-phase converter circuit during commutation when one SCR in one phase is turned on to turn-off an SCR in another phase, results in voltage notching

Description : What is the direction of flow of electric current in an electric circuit?

Answer : It  flows  from  anode  to  cathode  (direction  of   holes  flow)

Description : Pure inductive circuit takes power from the A.C. line when?

Answer : It takes power when voltage decreases and current increases.

Description : At ______ frequencies the parallel R-L circuit behaves as purely resistive.

Answer : At very high frequencies the parallel R-L circuit behaves as purely resistive.

Description : At very low frequencies a series R-C circuit behaves as almost purely?

Answer : At very low frequencies a series R-C circuit behaves as almost purely capacitive.

Description : In a series L-C circuit at the resonant frequency the?

Answer : In a series L-C circuit at the resonant frequency the current is maximum.

Description : Why does leakage occur in a magnetic circuit?

Description : For an RLC series AC circuit, the current at series resistance is (a) maximum at lagging power factor (b) maximum at leading power factor (c) maximum at unity power factor (d) minimum at unity power factor

Description : Briefly explain how the power factor of an inductive circuit can be improved.

Answer : As we know that power factor should be corrected to ensure that the current supplied is cost friendly. Meaning the power factor should be around one but not greater than one(0.8-0.9) in a ... an inductive circuit due to the inductive reactance which oppose the change of current in the ac circuit.

Description : Describe the difference between an open circuit and a short circuit.

Answer : Open circuit means the wire is cut meaning power will not flow and close circuit means wire is not cut and hence power will flow.Short circuit is the same as close circuit

Description : List three important characteristics of an electric circuit.

Description : A d.c. source has an open circuit voltage of 30 V and an internal resistance of 1.5 Ohm. A resistive load is connected to the source. Maximum power dissipated in the load is (A) 300 W (B) 150 W (C) 45 W (D) 20 W

Answer : A d.c. source has an open circuit voltage of 30 V and an internal resistance of 1.5 Ohm. A resistive load is connected to the source. Maximum power dissipated in the load is 150 W

Description : Permeability in a magnetic circuit corresponds to______ in an electric circuit.

Answer : Permeability in a magnetic circuit corresponds to conductivity in an electric circuit.

Description : In an A.C. circuit power is dissipated in?

Answer : In an A.C. circuit power is dissipated in resistance only.

Description : The apparent power drawn by an A.C. circuit is 10 kVA and active power is 8 kW. The reactive power in the circuit is?

Answer : The apparent power drawn by an A.C. circuit is 10 kVA and active power is 8 kW. The reactive power in the circuit is 6 kVAR.

Description : In an AC. circuit, a low value of kVAR compared with kW indicates?

Answer : In an AC. circuit, a low value of kVAR compared with kW indicates high power factor.

Description : The input of an A.C. circuit having power factor of 0.8 lagging is 40 kVA The power drawn by the circuit is?

Answer : The input of an A.C. circuit having power factor of 0.8 lagging is 40 kVA The power drawn by the circuit is 32 kW.

Description : Time constant of an inductive circuit?

Answer : Time constant of an inductive circuit increases with increase of inductance and decrease of resistance.

Description : Power factor of an electrical circuit is equal to?

Answer : Power factor of an electrical circuit is equal to R/Z, cosine of phase angle difference between current and voltage, kW/kVA.

Description : Can you apply Thevenin's theorem in an AC circuit?

Answer : It  can  be  applied  to  AC  circuits

Description : Can we apply Norton's theorem in an AC circuit?

Description : What is a node in an electrical circuit?

Answer : a positively charged electrons

Description : What is the purpose of a capacitor in an AC circuit?

Answer : Every AC supply is not ideal AC it contains DC component so to provide restriction to DC component in supply we have to use Capacitor

Description : In a series RLC circuit, which one does not change with change in input frequency ? (A) Bandwidth (B) Quality factor (C) Resonant frequency (D) All of them

Description : Sparking occurs when a load is switched off because the circuit has high?

Answer : Sparking occurs when a load is switched off because the circuit has high inductance.

Description : When one leg of parallel circuit is opened out the total current will?

Answer : When one leg of parallel circuit is opened out the total current will decrease.

Answer : If a D.C. shunt motor is working at full load and if shunt field circuit suddenly opens this will make armature to take heavy current, possibly burning it.

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