Determine impedance - resultant current and power factor, Electrical Engineering

Determine Impedance - Resultant current and Power factor:

In series R-L circuit, illustrated in Figure , Determine

1.      Impedance,

2.      Resultant current,

3.      Power factor and its nature, and

4.      Quality factor.

66_Determine Impedance - Resultant current and Power factor.png

Figure

Solution

The inductive reactance XL is given by

XL = ωL

= 2π fL

= 2π × 50 × 0.1 Ω

= 31.42 Ω

The impedance in rectangular form is given by

Z = R + j X L  = 10 + j 31.42 Ω

In polar form   Z = 32.97 ∠ 72.345o Ω

The resultant current is given by

i = ν / Z = 220 ∠ 0o / 32.97 ∠ 72.345o

= 6.672 ∠ - 72.345o Amp.

The current is lagging (since the circuit is inductive).

The power factor angle, φ, is the angle between voltage current

φ = 72.345o (lagging)

∴          p.f. cos φ = cos (72.345o)

= 0.303 (lag)

On the other hand, the power factor may be determined by

cos φ = R/ Z

=          10 /32.97

= 0.303 (lag)

Quality factor is given by Q = 1/ cos φ = 3.3 .

Posted Date: 2/5/2013 1:03:06 AM | Location : United States







Related Discussions:- Determine impedance - resultant current and power factor, Assignment Help, Ask Question on Determine impedance - resultant current and power factor, Get Answer, Expert's Help, Determine impedance - resultant current and power factor Discussions

Write discussion on Determine impedance - resultant current and power factor
Your posts are moderated
Related Questions
research paper on gauss,s law?


RIM Read Interrupt Mask Instruction This  instruction is used  to read the  status  of interrupts  and  read the serial  input  data. The status  byte is loaded  into  the accu

Explain the term half duplex transmission. A half duplex channel can receive and send, but not at similar time. It's as a one-lane bridge where two-way traffic should give way

Q. Explain the External Data Bus? External Data Bus: A bus which connects a computer to peripheral devices. 8088 microprocessor has 16-bit registers, 16-bit internal data bus i

Define Voltage Source Multiplying DAC? Voltage source multiplying DACs use a reference voltage which is switched in or out by the digital data.  The converter is so-named becau


Q. A depletion MOSFET is given to have large V A , V P = 2.8V, I DSS = 4.3 mA, v DS = 4.5V,and v GS = 1.2V. (a) Is theMOSFEToperating in the active region? (b) Find iD.

Microprocessor 1. Write an assembly language program to find the highest among two numbers. 2. Draw and illustrate the internal architecture of 8085 briefly. 3. What is t

NOR Gate NOR means NOT OR . it complements the  output  of an OR  gate.  The symbol  of Nor  gate in fig. (a) shows that a Nor  gate  comprises  of an OR  gate followed  by a N