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'Power' is not 'consumed'; it is simply a 'rate' -the rate at which 'energy' is being consumed.
No energy is being consumed by a load which is either purely inductive or purely capacitive so, for such loads, the rate of energy consumption, or the power, would be theoretically be zero. However, purely inductive or capacitive circuits only exist in theory, and all circuits exhibit some degree of resistance, so you will never have a condition under which the power of an a.c. circuits truly becomes zero.
Wiki User
∙ 11y ago
The power consumed in an AC circuit becomes zero when the voltage and current are in phase with each other. This means that the voltage and current waveforms reach their maximum and minimum values at the same time, resulting in a power factor of 1. In this case, the power consumed by the circuit is purely reactive and does not contribute to any real power dissipation.
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What happens to the total resistance in a parallel circuit with a short?
In case of parallel circuit the effective resistance is given by Reff = R1*R2*R3 /(R1R2 +R2R3 +R3R1) As short circuit takes place then anyone R1,R2,R3 becomes zero. Hence Reff becomes zero.
In a series circuit what would happen if one of the bulbs stopped working?
All the bulbs will go out. In a series circuit, the current at all points is the same. This is Kirchoff's Current Law. If you loosen or remove a bulb in a series circuit, the current at that bulb becomes zero, and by Kirchoff's Current Law, the current in every part of the circuit also becomes zero.
Is the resistance of the inductor is zero?
The power consumed by an inductor is not zero since it's resistance is not zero either. The power consumed is just too minimal that it can be ignored. What the inductor does is, during one half of the Current's sinusoidal waveform, it stores energy in the form of magnetic flux. During the next half,it discharges the stored energy into the circuit by losing the magnetic field. Hence,they say it doesn't consume power. If the inductor's resistance was significant then you will see that it will consume power. Resistance and Reactive resistance are two different things.
Why is there no power consumed in reactive components?
While it seems there is no power consumed in reactive components, the reality is that there is power transfer, which must be considered in the system design.Power is amperes times volts, but in a reactive circuit, the two are not in phase. If the phase angle becomes 90 degrees (a power factor of zero) the effect will be the appearance of zero power.Supplement. Consider the transformer for a start. The magnetic susceptibility curve for the transformer core forms a hysteresis loop. That S-shaped diagram you remember. The area inside the loop is power lost in the system, and goes to make the transformer a little warm.the same applies to any inductor. And there is always a small resistive loss in the copper wire as well.(Unless you have a super-conductor and some liquid helium to hand.)The capacitor is next. It works by storing the energy as a distortion of the "crystal matrix" of the dielectric material. Which is not as lossy as the iron core of an inductor, but does have some loss.In closing, the transformer reflects to the supply side, the reactance of the whole circuit as seen by the secondary side.
In the simplest of dc circuits where the resistance is zero what kind of circuit is it?
A short circuit.
What is meant by wattless current?
Current flowing through an ac circuit in which power consumed is zero is called wattless current.
What will be the power in Short circuit?
the power will be zero.
What would happen to circuit if there was no resistance?
a circuit with no resistance or zero resistance can be considered as open circuit in which the current is zero. without resistance the circuit just becomes open ()
Under what condition will the power factor of a series R-L circuit approach unity?
When the Inductor's value equals Zero, then the Power Factor reaches 1. Conversly, when the Resistance equals 0, the Power Factor becomes Zero. The Power Factor for a Series R-L Circuit is equal to R / sqrt (R^2 + (w*L)^2 )
What is the terminal potential in the short-circuit?
in the case of short-circuit the current is maximum hence the terminal potential is becomes zero
What happens to the total resistance in a parallel circuit with a short?
In case of parallel circuit the effective resistance is given by Reff = R1*R2*R3 /(R1R2 +R2R3 +R3R1) As short circuit takes place then anyone R1,R2,R3 becomes zero. Hence Reff becomes zero.
What will b the power factor of a series circut when r is made zero?
The power factor never depends on the resistance of a circuit. It depends on the equivalent inductance and capacitance in the circuit, and on the frequency of the power supply, even if the resistance is zero.
Power factor for pure resistive circuit?
ratio between true power and apparent power is called the power factor for a circuit Power factor =true power/apparent power also we conclude PF=power dissipated / actual power in pure resistive circuit if total resistance is made zero power factor will be zero
In a series circuit what would happen if one of the bulbs stopped working?
All the bulbs will go out. In a series circuit, the current at all points is the same. This is Kirchoff's Current Law. If you loosen or remove a bulb in a series circuit, the current at that bulb becomes zero, and by Kirchoff's Current Law, the current in every part of the circuit also becomes zero.
Why capacitor is connected to earth in circuit?
when a capacitor is connected to earth the potential of capacitor becomes zero. as a result all the charge residing on the conductors of a capacitor passes away and the final charge on capacitor becomes zero
How do you write 9 times 10 to the zero power in standard form?
9x100. Since anything to the zero power is 1, this becomes just 9.
Is the resistance of the inductor is zero?
The power consumed by an inductor is not zero since it's resistance is not zero either. The power consumed is just too minimal that it can be ignored. What the inductor does is, during one half of the Current's sinusoidal waveform, it stores energy in the form of magnetic flux. During the next half,it discharges the stored energy into the circuit by losing the magnetic field. Hence,they say it doesn't consume power. If the inductor's resistance was significant then you will see that it will consume power. Resistance and Reactive resistance are two different things.
