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Does the current reach its maximum peak value at the same instant time in as does the voltage?
Yes if the power factor is unity.Additional AnswerOnly if the load is purely resistive. For a resistive-inductive (R-L) load, the current will reach its maximum value after the voltage reaches its maximum value, and we say the current is 'lagging the voltage'. For a resistive-capacitive (R-C) load, the current will reach its maximum value before the voltage reaches its maximum value, and we say the current is 'leading the voltage'.The angle of lag or lead is called the circuit's 'phase angle' and the cosine of that angle is termed the circuit's 'power factor'. So, for a purely-resistive circuit, the phase angle is zero and the power factor is 1 ('unit'). For R-L circuits, the power factor is less than 1, and is described as 'lagging'. For R-C circuits, the power factor is also less than 1, and is described as 'leading'.
What is single phase power factor meter?
Power Factor applies to all A.C.(alternating current) power supplies. It ma not be apparent when a purely resistive load is applied as this offers a PF of 1.0 but any other load type will have a power factor somewhere between 0.0 and 1.0.
What is the minimum value of power factor of a circuit can have under what circumstances can this occur?
Power factor is the cosine of a circuit's phase angle. A power factor of 0 (its lowest value), therefore, results from a circuit whose load current leads or lags the supply voltage by 90 degrees. In practise, this is unlikely to occur, as it requires either a purely-inductive or a purely-capacitive load and, real-life circuits have resistance.
How do you find the power factor for a 240 V and 480 V single phase heaters?
Power factor is the cosine of the phase angle -i.e. the angle by which the load current lags or leads the supply voltage. Heaters are resistive loads (although not 'purely' resistive), which means that the load current is practically in phase with the supply voltage, making the resulting power very close to unity (1).
What is the nature of power factor and its variation with firing angle when a single phase voltage controller feeds a resistive load?
With a pure resistive load the Power Factor should be 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
Name type of circuit load which the apparent power is greater than the active power?
Inductive loads have a power factor of less than 1, which means the apparent power is greater than the active power in these circuits. This is due to the lagging power factor caused by the inductive components in the load.
In a circuit with resistive and inductive load what happens to the power factor as the resistive load increases?
The PF will increase
When is the power factor of a motor 1?
When the circuit is purely resistive or in resonance, i.e. capacitive and inductive reactance cancels out.Power factor is the ratio of apparent power over true power, and is the cosine of the phase angle between voltage and current.
Why power factor can not be unity?
Power factor can be unity. If the load is purely resistive, then the load current and supply voltage are in phase, and the load will have unity power factor.
What is the value of power factor for a pure capacitor?
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.
Compare the phase relationship between the voltage and current in a purely resistive circuit and an RL circuit?
In a pure resistive circuit the voltage and current are in phase. In an inductive circuit they are fro zero to 180 degrees out of phase. If they are in phase the Power Factor is 1 and 180 degrees the PF is zero. The exact amount of the phase difference depends on the specific circuit.
When an alternating voltage is applied to a purely resistive circuit the A voltage lags the current B the voltage leads the current Ccurrent leads the voltage Dcurrent is in phase with the voltage?
'A' and 'C' are saying exactly the same thing. The correct choice is 'D'. The complex impedance of a purely resistive circuit is purely real. Since there is no reactance, there is no phase shift, so the power factor is ' 1 ', KVA = KW, KVAR = 0, etc.
Different types of power factor in different circuits?
The different types of power factor are: # Leading ( Due to Capacitive Circuit) # Lagging (Due to Inductive Circuit) # Unity (Due to Resistive Circuit)
Does the current reach its maximum peak value at the same instant time in as does the voltage?
Yes if the power factor is unity.Additional AnswerOnly if the load is purely resistive. For a resistive-inductive (R-L) load, the current will reach its maximum value after the voltage reaches its maximum value, and we say the current is 'lagging the voltage'. For a resistive-capacitive (R-C) load, the current will reach its maximum value before the voltage reaches its maximum value, and we say the current is 'leading the voltage'.The angle of lag or lead is called the circuit's 'phase angle' and the cosine of that angle is termed the circuit's 'power factor'. So, for a purely-resistive circuit, the phase angle is zero and the power factor is 1 ('unit'). For R-L circuits, the power factor is less than 1, and is described as 'lagging'. For R-C circuits, the power factor is also less than 1, and is described as 'leading'.
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)
What is single phase power factor meter?
Power Factor applies to all A.C.(alternating current) power supplies. It ma not be apparent when a purely resistive load is applied as this offers a PF of 1.0 but any other load type will have a power factor somewhere between 0.0 and 1.0.
