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Power factor is least in capacitance or resistance or inductance?
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∙ 14y ago
inductance
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∙ 14y ago
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What is the Relationship between power factor and current?
When voltage and current waveforms are out of synch the power factor is reduced. In a pure resistance load the PF is 1. When inductance and capacitance is involved the PF is from 0 to 1.
Why the power factor of a transformer is poor at no load?
The inductance of the transformer is much higher than the resistance of the transformer, resulting in very low real power losses (in watts), but some reactive power (vars).
What is the relationship between inductance and power factor in an ac circuit?
for the purely inductance power,the power factor is zero because true power equals zero.here the power triangle would look like a vertical,because the adjacent (true power) side would have zero length....Engr. olunloyo university of lagos ,Nigeria
Why improve power factor?
A poor power factor is usually caused by coils; by inductors within electric motors. A capacitor is the opposite of a coil, and can improve the power factor by moving the current phase angle forward, more towards the voltage. Power factor degradation from inductive loads occurs because inductors resist a change in current, by "presenting" a higher resistance to a step (or any) change in current. As a result, current lags voltage, and power factor suffers. Capacitors are opposite to inductors. They resist a change in voltage, by "presenting" a lower resistance to a change in voltage. As a result, current leads voltage. Suppose that a capacitor is placed in parallel to an inductor. If the value of capacitance is adjusted so it exactly cancels the inductance at 60Hz, then the combination as a whole behaves purely as a resistor. If capacitive loads were common, then they would cause problems similar to inductors. However, adding capacitance in a case where there is also inductance serves to raise voltage, particularly since the conductors (power lines, etc.) leading up to the load are also resistive, inductive, and partially capacitive. By raising the voltage, power factor is improved, and the inductive loads (usually motors) cause fewer losses in power lines.
How can the variation of excitation of an alternator be used to control power factor?
When a generator is connected to a load it is never going to be perfectly matched because of its inductance, when you have inductance the current starts to lag.
What is Power that is applied to an entire circuit consisting of resistance capacitance and inductance is called?
The unit of power measured is watt, irrespective of resistance, capacitance or inductance of the circuit.
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.
Why in coil power factor is low?
A coil of wire acts as an inductor; it will have a very small resistance, and a relatively large inductance. Power factor is effectively the resistance divided by the impedance (made up of resistance and inductance), so the larger the inductance relative to the resistance, the lower the power factor will be.
What is the Relationship between power factor and current?
When voltage and current waveforms are out of synch the power factor is reduced. In a pure resistance load the PF is 1. When inductance and capacitance is involved the PF is from 0 to 1.
What are Examples of scalar?
Cost Temperature Speed Frequency Wavelength Electrostatic potential Electric charge Length Mass Volume Capacitance Inductance Resistance Energy Power
What is a LCR Q meter?
LCR meters measure inductance capacitance and resistance Q requires 2 at once and probably a frequency range you may care about q meter will probably have two readouts and you may be able to change from Q to power factor
What is a LCR Q-meter?
LCR meters measure inductance capacitance and resistance Q requires 2 at once and probably a frequency range you may care about q meter will probably have two readouts and you may be able to change from Q to power factor
What IS power factor on 40VA 24VAC?
There is insufficient information in the question to answer it. You need some other information, such as voltage to current phase angle, inductance, capacitance, or watts. Please restate the question.
Why the power factor of a transformer is poor at no load?
The inductance of the transformer is much higher than the resistance of the transformer, resulting in very low real power losses (in watts), but some reactive power (vars).
What are the effects of reactive power?
inductance and capictances, lowpower factor
Why do you rate a dc machine in watt but a transformer in kilo volt-ampere?
The difference between watts and volt-amperes is due to the relative phase angle, or power factor, between voltage and current. In a DC system, the two are in phase. In an AC system, with only resistance, the two are also in phase. Add capacitance or inductance and the phase angle changes.
How the section of a transmission line can be used as lumped circuit element?
Actually in networks we will consider the elements like resistance, inductance, capacitance as lumped elements for simplicity, like this in power systems we will consider the transmission line parameters(resistance, inductance, capacitance) as lumped elements, because we will calculate all the parameters of power systems with respect to receiving end or sending end but not with respect to middle of the line. If a fault occurs on transmission line then we should not consider the lumped elements of that total transmission line, we should consider the lumped elements from sending end to the point where the fault is occurred.
