Answer / sanjay dalvi

power factor of DC system is allways 1,why??
in DC POWER SUPPLY a power supply is constant in nature,
p=v*i angle between voltage & current is zero that is
current is in phase with voltage, cos$=0
for dc supply $ =0
& we know that cos 0 =1
so we can proove that cos $ =1 hence
p= V I COS$
P= V I KW

Answer / k.prakashchandra

unity

Answer / kesavan.03

Power Factor is nothingbut the phase angle between Voltage
& Current. In AC System power factor will be lag & lead
system due to its nature of wave form & phase angle
difference.

As in the case of DC System there is no power factor term
is used because DC System has constant voltage & Current..
So phase difference is zero.

Power = V x I x cosØ

for DC System cosØ = 1 ( Ø = 0 degree)

Since cos 0 = 1

Answer / eng.ahmad

the power factoe is 1 in dc system if tehere is no ripple.
for example if you test the pf of battery charger you will
find it less than 1 because of the ripple, and you can
solve this problem by using coil (chock).

eng.ahmad from iraq

Answer / t swetha

powerfactor of dc supply is 1 why because there is no phase
difference between the voltage and current

Answer / fazul

In a.c system current and voltage are lag or lead according
to the inductance or capacitance.
but in d.c system current and voltages are inphase with each
other.so phase angle between current and voltage is zero.
we know p.f=cosO
p.f=1

Answer / aye thwin

1) Assuming DC supply is pure DC or constant, if load current is pure dc current, it is power factor=1, if not pf <1.
2) For DC system, should not use cos value which is related to ac system.
3) Power factor is not only relative to reactive power , but also need to consider the distortion power which is related to harmonic.

Answer / sakthivel

in dc system voltage and current are in phase so here no
power factor

Answer / naagaraju badara

In dc capacitor acts as o.c and inductor as s.c and in pure resistor angle b/w v&i is zero hence it will be unity always

WHAT ARE THE FACTORS REQUIRED FOR SELECTION OF TRANSFORMER RATING?

13 Answers   Tech Mahindra, Technip,

How to obtain B license from TNEB license board. What is eligibility?

11 Answers   Core, Reliance,

what transformer we used normally and upto which kva?

0 Answers  

star delta starter single line digram

1 Answers  

What is oscillator circuit?

0 Answers  

Is necessary Protection CT, CLASS - 5P10 fitted at Incomer side of main Breaker ? Why ?

1 Answers  

what is safety measures of alternator.

10 Answers   HP, MNC,

Can i connect all earth pits in ring system..., And wat IS 3043 says...please help me

1 Answers  

Refernce currents are to be generated using refernce cueernts how can this be done

0 Answers   ABC, Wipro,

What is meant by stator? What is meant by rotor?

0 Answers  

what is the working principle of induction motor

2 Answers  

What is the use of iron core in a transformer?

0 Answers