Answer / andrew d&

I/VxR
where I = CURRENT, v = VOLTAGE and R = resistance.

Answer / thanigaivel

p=v*icos@
i=p/v
p=power-watts
v=voltage-volts
i=current-amps
cos@-power factor

Answer / raj

If We want to calculate the current of a circuit we should know at last two factors. The basic formula from OHM's law is

I= V/R
and also I= W/V
in 1phase power factor is neglected but in three phase it should be consider

why earth wire is needed in a wiring system

1 Answers  

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1. A 380 / 220 V r.m.s. 3-phase 4-wire circuit carries loads of 8 + j8.1 ohm; 4 + j4.1 ohm; and 2 +j2.1 ohmin the three phases respectively. The length of the circuit is 100 m, and the resistivity of the phase conductors is 0.0005 Ω/m. The neutral conductor is of the same size as the phase conductors. a) Select a reference angle 0for the first phase. Then write down the three phase voltages in both polar format and complex number format. b) Make appropriate assumptions, and take temperature effects on resistance is insignificant. Calculate the currents in the three phases. (Note: Determine conductor resistance, and apply Kirchhoff’s Voltage Law) Based on the result, suggest a main switch rating for the circuit. c) Show your preferred direction of neutral current in a diagram, and then determine its value. (Note: Apply superposition principle, and Kirchhoff’s Current Law) Use its magnitude to show that in this circuit, the unbalanced load may increase the voltage drop in some of the phases. (Note: Also observe the common volt drip in neutral) State your assumptions, if there are any. d) Suddenly the neutral wire of the circuit is broken. Estimate the new currents in the first phase, i.e. Phase L1. State your assumptions, if there are any.

0 Answers  

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What is UJT PNP, NPN transistor & working principles?

1 Answers   TATA,

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arcing is due to only capacitance or it is due to both inductance and capacitance? explanation.

2 Answers  

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Dg pf .71 i am improve pf 0.80 what capacitor connected in dg how?

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how fluoresent lamp works??

2 Answers  

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why dc motor is called constant flux motor?

1 Answers  

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explain the transient reactance

1 Answers  

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transformers parts & function of each parts

25 Answers   Amara Raja, Bhutan Ferro Alloys Limited, Breather, Electrical, Electrical Tech, ERDA, GVK, Juniper Networks, Matrix, Mechanical, NFL, Oracle, Pyramid Plastics, RPPL, RRB, Siemens, TCS, Tulip Silk Mills,

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Which Class insulation is prefered for the sandwich Busducts ? Why?

0 Answers  

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Is there any rule to select the voltage of motor based on KW rating? What is the rating above which lt motor becomes the HT motor?.

0 Answers   DAE,

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why can tv operate at low voltage??

2 Answers  

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