Answer / ran145

In an AC circuit whose impedance consists of reactance as
well as resistance, the voltage and current are not in phase.
when there is reactance in an AC circuit, the product Erms
Irms is greater than the true power. The excess is called
reactive power.

In DC impedance is a pure resistance hence the voltage and
current are in phase which produces true power
i.e.P=Erms*Irms . hence there is no reactive power in DC.

Answer / k.prakashchandra

Dc produces a steady magnetic field unlike AC

Answer / sp

in case of dc supply the frequency is zero

Answer / srikanth

active power is VI COSΦ and reactive power is VI SINΦ.In dc circuits v and I will be in phase.that is Φ=0. so COSΦ=1 and SINΦ=0.so no reactive power.

Answer / haydad ahmad

There is no reactive power in dc circuits because reactive power is produce due to phase difference in ac circuits but which is not in dc circuits .In dc circuits V and I lies at straight line so reactive power in dc circuits is zero.

Answer / rohan joshi

In D.C phase angle is zero. hence power factor is 1.
we know that reactive power is Q=VISin(angle), so its zero.

Answer / sethar12

Is the impedance in a DC motor with magnetic field in its
winding pure resistive? Is the current not consumed in this
inductive load?

what is intermediate switch

1 Answers  

How many earthing pits are requier to disapper the surge current of one lighting arrester.

3 Answers  

why using transformer and thyristor switch in 3 phase apfc panel

0 Answers   Reliance,

Normally the starter used to reduce the starting current.but the dol starter do not it,so why we use it?

4 Answers  

what is the difference between the following 2 situations ? 1)Line & Neutral=240V Line & Earth=230V Neutral & Earth=10V 2)Line & Neutral=230V Line & Earth=240V Neutral & Earth=10V

2 Answers   Reliance,

how i prepare for the written test in mahagenco?

2 Answers   MahaDiscom, MahaGenco, Wipro,

Ac generato how produce power I need for camplet defination

0 Answers   KCL,

15 suspects are rounded by the police and questioned about a bank robbery. Only one of them is guilty. The suspects are made to stand in a line and each person declares that the person next to him on his right is guilty. The rightmost person is not questioned. Which of the following possibilities are true? A. All the suspects are lying. B. The leftmost suspect is guilty. B only

2 Answers   TCS,

why the colour of insultor stack , petticoat is brown. Is it has some technical reason.

0 Answers  

Slipring moter find external resistance

1 Answers  

A 11000/415V distribution transformer is fed 415V upon it's LT side,Do I get 11000V upon it's Primary side ?

7 Answers  

Why efficiency of generator is higher than motor at a particular load?

0 Answers