Answer Posted / ayub
By defenition , power factor is the cosine of the phase
angle between voltage and current in any electric circuit
Suppose we have an electric circuit to which an AC supply
is applied . Now the flow of current depends on the circuit
constants like Resistance, inductance ,Capacitance of the
circuit
Now if the circuit is purely resistive in nature, then we
see that the AC current flowing through the circuit has got
the same variation as that of the Voltage at the same time
ie the current reaches the maximum value at the same time
the voltage reaches the maximum value and so on . here we
say that the voltage and current is in phase
Now if the circuit is purely inductive, then the current
reaches the maximum after 1/4 of time of one cycle and so
on . In this case the current is said to be lagging the
voltage . The fundamental reason for this time lag is the
property of the inductor by which it doesnot allow any
sudden change of current through it
Finally, if the circuit is purely capacitive in nature then
in such circuit we will see the voltage lagging the current
(in otherwords current is leading the voltage )by 1/4 th
cycle . The basic reason is that when the capacitor is
getting charged from zero ,the current will be maximum
initially and it reduces to zero when the capacitor is
fully charged .ie the current is maximum when the voltage
across it is zero and so on ( or otherwise capacitor will
not allow any sudden voltage acoss it
The foregoing expalnations are put in mathematical form to
define power factor as described in the first paragraph
Is This Answer Correct ? | 11 Yes | 1 No |
Post New Answer View All Answers
When we giving the 3 phase supply to ups system how to coming netural?
What are the necessary solutions needed to be carried out on a malfunctioned earthing mechanism of a VACUUM CIRCUIT BREAKER.(TAMCO)
two way ckt diagram can be drawn by how many ways? give diagram
I want to ask that is there any relation between current denesity of copper and material purity. also is ther any standard which defines the standard current denesity of material.
Hi guys! Plz help me to answer the following questions. 1. What are the types of transmission line energy losses? 2. Why are the VLF are used some types of services? 3. What frequencies are used for reliable beyond the horizon terrestrial communication without repeaters? 4. To permit selection of 1 out 16 equi-probable, what is the number of bitis required? 5. What is the most common modulation used for telegraphy? 6. What is the multiplexing is used to increase the capacity of the optic fiber? Thanks
how can i determine the KVA/MVA rating of transformer precisely?? is there any standard test?????
what is capacitor voltage transformer?? how it is different from potential transformer?
all interview questions with answers of ntpc (2000-2009
how power trnafor from 1 point to another point in bus bar ya transmission line( voltage trnasfer from 1 point to another poin)
Why slip ring ind. motor power consumption is low compare to induction motor .same 90 kw motor used same load output
What is clock position of Transformer?what are the clock positions are there?and what is different of them?
Why the power factor improvement is so important in industrial loads
What is miller crystal oscillator? Explain its operation?
what is the minimum clearance between a 11KV 150KVAR capacitor cell and series reactor.can a series reactor can be mounted in the same structure of the capacitor cells structure
we have amp, voltage, kw, length detail then how to calculte copper & alluminium size of conductor of 3-phase induction motor