0
0.
Power factor has to do with the amount of real power. if you have a purely capacitive load, there is no real power flow, thus pf = 0. For purely resistive load, power factor will be 1.0.
Wiki User
∙ 14y ago
Anonymous
Zero
Add your answer:
Earn +20 pts
What is the value of power factor for a pure inductor?
Angle between v and i is 90 deg so, cos 90 = 0 Same for pure capacitor
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
What are the problems with switching AC currents in a circuit of pure resistance at unity power factor?
Power factor does not apply to a resistive circuit. Just the current will follow the voltage (in phase)
Is there any power consumed in pure inductor and pure capacitor?
In an AC circuit energy flows into an inductor in one quarter-cycle and flows out on the next. Ditto for a capacitor. Therefore over a cycle, no net power or energy is consumed in a pure capacitor or inductor.Another Answer'Power' is the rate at which energy is transferred. In the case of 'pure' inductance or capacitance, energy flows from the supply to the device during the first quarter-cycle of current, where it is temporarily stored within the magnetic (inductors) or electric (capacitors) field, only to be returned to the supply during the following quarter-cycle. You could describe this action as 'energy sloshing back and forth between the supply and the device'. The rate at which this energy transfer takes place is called 'reactive power' and is expressed in 'reactive volt amperes'. None of this energy is lost or, to use your expression, 'consumed'.'True power', expressed in watts, is the rate at which energy is expended -i.e. energy taken from the supply and then dispersed through work (e.g. by motors) or heat transfer (losses). This does NOT occur in purely-inductive or in purely-capacitive loads. So, in answer to your question, 'power' (in the sense of 'true power') is NOT 'consumed' by a pure inductor or capacitor (remember, technically, it's energy that gets consumed, not power -power is simply a rate).You should bear in mind, however, that there is no such thing as a 'pure inductor' or 'pure capacitor' as each will exhibit some degree of resistance. Resistance results in the expenditure of energy, the rate at which it occurs being 'true power'. So 'real' inductors and capacitors combine 'reactive power' with 'true power', the vector-sum of which we call 'apparent power', expressed in volt amperes.
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 is the value of power factor for a pure inductor?
Angle between v and i is 90 deg so, cos 90 = 0 Same for pure capacitor
Why and where is a power factor regulator used?
The desired power factor value is 1. The PF is closest to 1 if the load is pure resistive. In an industry, the load is mix of resistive and inductive, more so largely inductive, the power factor tends to be less then 1 , lagging, which is not desirable. Hence power factor regulator (controller) together with suitable capacitor banks (to compenesate for lagging PF , in order to bring it towards unity (1)) are used in industry. Capacaitor banks are generally connected to load side, closer to loads. Practically to PCC or MCC locations. Capacitor banks are never connected to Generator sets.
What type of function of capacitor in dc power supply?
It filters ac to pure dc
Can a furnace operate on a power factor of 0.2?
If a furnace has a power factor not equal to 1 then there is a motor involved. If it was pure resistive element the Power Factor would be 1. That being said the motor can operate at .2 PF, but this is unusual and not very efficient. If this is the case I would expect that you have a bad motor control circuit and there may be a blown capacitor.
What is the power factor of pure resistor?
1
What is the wattage required for a device drawing 35 amps?
Watts = Volts x Amps x Power Factor To make your calculation you need to plug-in the Voltage and Power factor. The Power Factor is a value from zero to one with one being a pure resistive load.
What is the power factor in pure inductors explain?
The power factor (cosine of phase angle) of pure inductor is zero because the phase angle between current and voltage is 90 degrees .If the value is substituted in the formula It will be zero.
What is the approximative power factor of an incandescent lamp?
Incandescent lamps are nearly pure resistive loads with a power factor of 1
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
Method of improving power factor correction?
In AC electric systems, electrical energy is consumed by resistive loads. An AC generator sends out energy, and a resistive load takes the energy in.But in AC systems, electrical energy is not consumed by pure capacitor loads. Neither is it consumed by pure inductive loads. Instead these loads reflect all energy back to the generator. They don't consume any electrical energy themselves. Ideally this shouldn't cause problems. However, in the real world a pure capacitor load will cause the power lines to become warm. While the energy flows out and back, there is an electric current in the lines. The same thing also happens with a pure inductive load. The loads reflect all energy and consumes none, but the utility company must use up fuel to keep sending out the reflected power and warm the power lines.If large industrial customers place inductive or capacitive loads on the power grid, the utility company installs special electric meters to measure this. The electric company then charges them a fee. The industrial customer must pay for the energy losses they cause in the warm power lines.In AC electrical mathematics, the reflected power effect is described as REACTIVE POWER, and is measured in terms of POWER FACTOR. A resistive load consumes the incoming energy, and it has a power factor of 100%. On the other hand, pure capacitors and inductors reflect all the incoming energy, and they have a power factor of 0%.There is a way for industrial customers to fix the problem. There is a way to correct the power factor and bring it to 100%. If the customer is using an inductive load, they can place just the right value of capacitor across that load. The energy then stops reflecting back to the electric company generators. No longer do the power lines suffer excess heating. The electric company measures this, then stops charging the extra fee. (Actually the energy still reflects back and forth between the inductive load and the added capacitor. The excess heating in those short local wires is insignificant.)Since large industrial customers commonly use AC motors containing coils, they commonly create inductive loads on the power grid. Power-factor correcting capacitors are the solution. They eliminate the extra fee charged by utility companies, so a PFC capacitor will eventually pay for itself. However, such capacitors cannot save money for individual homes or small businesses. These customers don't have the special electric meters, and the utility companies aren't charging any special fees for bad power factor. Those PFC capacitors don't save any money, and can never pay for themselves.Power factor is the cosine of a circuit's phase angle, i.e. the angle by which the load current lags or leads the supply voltage. When they are in phase (phase angle is zero), the power factor is unity (i.e. 1); when they are 90-degrees out of phase, the power factor is zero. 'Poor' power factor (i.e. when it is closer to zero than to unity) results in excessively-high currents for a given value of load; power-factor correction (or 'improvement') acts to move the power-factor towards unity, thus reducing the value of that load current. This is desirable, as it reduces the necessary amount of copper (i.e. the cross-sectional area) of conductors and other equipment supplying the load. For inductive loads, power-factor correction is achieved through the use of capacitor banks.
What is standard power factor value?
The power factor measures the phase difference between a current and a voltage waveform. Power factor ranges from zero to one. A power factor of 1 is for a pure resistive load. Power factor decreases for loads like motors with high inductance. Power factor comes into play when determining the watts used by a device. Watts = Volts x Amps x PF. So ideally for efficiencies sake, you want to keep the PF as close to one as possible.
Is pure inductor consumes energy?
Pure inductors consume and produce power, just like other reactive devices. The difference is that the current is not in phase with the voltage, resulting in the waveform of the power being oscillating about zero, with a net mean power of zero. In this "pure" case, the power factor is zero, but that does not mean there is no power - its just that the power "reading" is unsophisticated and not compensating for power factor.
