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Power factor is real power divided by total power. Power factor can be written as:
pf = R / sqrt(R^2 + X^2),
where X is the reactive resistance of the active elements (in this case, L):
pf = R / sqrt (R^2 + (wL)^2)
w = frequency in radians of the AC frequency for which the power factor is to be calculated.
Wiki User
∙ 13y ago
Wiki User
∙ 12y agoOK, I'll try it . . . This is going to be an approximation to the truth. I hope it'll be
close enough to suit your requirement:
The power factor is going to depend on the frequency you're trying to pump
through the circuit.
As I recall from the days when I was Mike Faraday's scoutmaster and he was
struggling to earn his Electricity merit badge, the power factor is the cosine of
the phase angle between the voltage and current, and the tangent of that
angle is the reactance divided by the resistance.
The reactance is J = (2 pi) x (frequency) x (L)
Tan(phase) = J / R
Magnitude of the complex impedance is Z= sqrt(J2 + R2)
cos(phase) = R/|Z| = R/sqrt(J2 + R2) and don't forget that J = 2 pi freq L.
That looks right, because as as the inductance becomes smaller, 'J' goes to zero,
and that expression for the power factor would go to ' 1 ', as it should.
In conclusion, I think the power factor is "leading", because wherever inductance lurks,
the voltage leads the current.
I'm sure things have changed since those days, but I'm still going to submit this
as my proposed solution.
AnswerThe terms 'leading' and 'lagging' refer to what the load current is doing, relativeto the supply voltage. In an L-R circuit, the load current lags the supply voltage,
so the power factor is a 'lagging power factor'.
Wiki User
∙ 13y agoThe power factor is given by R/Z
Wiki User
∙ 11y agoPower factor is one
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Will the impedance in a series RL circuit increase as the frequency decreases?
When the frequency of Parallel RL Circuit Increases,XL increases which causes IL (current through inductor) decreases. Decrease in IL causes It (It=Il+Ir) to decrease,which means by relation IT=Vs/Zt ,the Zt (Total Impedance) Increases.
What is the Relationship between resistance and inductance in a RL circuit?
What is the Relationship between resistance and inductance in a RL circuit?
In a series rl circuit when XL increases and r remains the same z will?
z=rl +XL in a series circuit. if XL increases and r remains the same, z will increase. z is a complex number and the magnitude is z=(r^2 + (XL)^2)^.5. if the vector part of z increases z increases.
How are the voltage drop across R and XL related in series RL circuit?
Voltage drop across a circuit is IZ, where I is current and Z is impedance. In other words IZ = IR + jIX, where R is resistance and X is inductance
Why RC circuit is preferred over RL circuit in waveshaping?
There is no true advantage of RC circuits over RL circuits, as they perform different functions. RC circuits contain resistors and capacitors, while RL circuits contain resistors and inductors.
How do you calculate the time constant for a simple series RL circuit?
The time constant of an RL series circuit is calculated using the formular: time constant=L/R
What are the difference between rl and RC circuit?
RL circuits involve a resistor and inductor in series. RC circuits involve a resistor and capacitor in series. You can see where the acronyms come from.
Will the impedance in a series RL circuit increase as the frequency decreases?
When the frequency of Parallel RL Circuit Increases,XL increases which causes IL (current through inductor) decreases. Decrease in IL causes It (It=Il+Ir) to decrease,which means by relation IT=Vs/Zt ,the Zt (Total Impedance) Increases.
What is RL circuit in ac voltage?
An RL circuit is a circuit containing resistance (R) and an inductance (L).
Why you use three phase supply in experiment of power factor of RL series circuit?
You don't necessarily. For a straightforward series (or parallel) R-L load, you will only require a single-phase supply. However, if you had three R-L loads, connected in delta or star (wye), then you would require a three-phase supply.
What is the power consumption of the circuit, assuming a short-circuit and an open-circuit between A and BWhich resistance RL can you use such that the power consumption is the average of these two extreme cases?
here is the picture
What is the Relationship between resistance and inductance in a RL circuit?
What is the Relationship between resistance and inductance in a RL circuit?
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.
What are the effects of Rs and Rl?
The values of Rs and Rl in a circuit impact the current and voltage levels within the circuit. Rs represents the source resistance affecting the input impedance, while Rl represents the load resistance affecting the output impedance. A variation in these values can cause changes in signal attenuation, power dissipation, and overall circuit performance.
What is driven RL circuit?
A driven RL circuit is a circuit that contains a resistor (R) and an inductor (L) connected in series with an external source of alternating current (AC) or voltage. The external source provides energy to the circuit, driving the current through the inductor and resistor. This circuit can exhibit interesting behavior such as resonance and phase shifts due to the interplay between the inductive and resistive components.
In a series rl circuit when XL increases and r remains the same z will?
z=rl +XL in a series circuit. if XL increases and r remains the same, z will increase. z is a complex number and the magnitude is z=(r^2 + (XL)^2)^.5. if the vector part of z increases z increases.
What are the types of electric circuit?
Rl,rc,rlc
