Answer / k.prakashchandra

At the beginning of positive half cycle, the capacitor draws
peak positive current ,hence it is taken as leading and in
case of inductance the current is negative peak , hence
taken as lagging.In pure resistance, the current is in phase
with voltage.

Answer / keerthana

The reason that current leads voltage in a capacitor is
rooted in the way a capacitor works. Picture the capacitor.
It's basically two conductive plates separated by a short
distance and having a dielectric (insulator) between them.
Now, let's specify that our cap (capacitor) is completely
discharged and we'll hook it up to a DC voltage source
through a switch. Flip the switch on and current will begin
to flow, but it is important to look at what happens in just
the first instant of time. Electrons will begin to
accumulate on the negative plate and their presence there
will drive electrons off the positive plate. The capacitor
is building up a charge. It is developing a voltage across
(or between, if you prefer) the plates. But electrons have
to begin to pile onto the plate to actually create the
difference of potential (voltage) between the plates. The
moving electrons (and that's current) that are piling on the
plate are already beginning to flow before the voltage is
developed between the plates, so current is said to lead
voltage in a capacitor.

Answer / gesan

The capacitor offers more impedance( Resistance + Inductance)

why we have to particulary use ACB for below ratings,even available of MCB,MCCB with that range ?

0 Answers   Siemens,

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How phase to phase voltage comes 440V.

0 Answers  

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4 Answers  

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0 Answers  

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9 Answers   NTPC,

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1 Answers  

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How many earthings are required for commissioning the Transformer?

14 Answers   Dalmia Group, HSL,

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what is mean by harmonics?Type of harmonics?

6 Answers  

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(1)The demand for electricity , the amount of renewable generation available, the amount of fossil fuel generation available and the cost of the fossil fuel generation are shown in table below period(hrs) demand(MW) renewable (MW) fossil- fuel(MW) cost of fossil fuel(MW) 00.00 - 01.00 2000 1800 2000 30 01.00 - 02.00 2300 2500 2000 30 02.00 - 03.00 2500 2700 2100 45 03.00 - 04.00 2900 3100 2100 50 04.00 - 05.00 2700 2600 2500 45 05.00 - 06.00 2400 2000 2700 50 06.00 - 07.00 2200 1800 2000 36 07.00 - 08.00 2100 1600 2000 36 Assuming that the renewable generation incurs zero cost, determine an optimal generation schedule(specifying the amount of renewable generation and fossil fuel generation used in each period, the cost for each period and the overall cost for 8 hours.)

0 Answers  

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what is the formula for computing cable tray size & capacity

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what is resonance in electrical circuit and its effect? where we get high resonance and low resonance?

1 Answers  

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