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?

in transmission line 11kv is step up or step down? why?

5 Answers  

what is the use of earthing ?

8 Answers   Electrical Tech,

What is the rating of circuit breaker needed for 300 KVA load in 33 KV supply line in a transformer of 33 KV / 415 Volt ?

0 Answers   Hira Group,

How we calculate airgap between phases & terminal box of the transformer? any formulae.

1 Answers  

1.what is the difference between MPCB and MCB ? 2.what is the difference between MPCB and MCCB ?

6 Answers  

for flour light (garden light) how much deep need to put 222ov 0

1 Answers   Anantara Hotels,

Can a dc motor works as a dc generator. If yes , then how?

2 Answers  

What is the basis for framing the rules of block diagram reduction technique?

0 Answers  

A 6.6 KV/ 440V Xformer. what are the imporatant parts & equipment required for it's protection panel.

0 Answers   APTransco,

what is the proximity & ferranti effects can you explain to me

1 Answers   APTransco,

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

0 Answers   APTransco,

working of a diesel generator.

34 Answers   ABC, AC, Cognizant, CTS, Directorate of Lighthouses and Lightships, KSL, Quippo, Shree Renuka Sugars, SRF, Svam Power, Tech Mahindra,