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JC123
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Voltage

10/31/2013 10:26 AM

What is the voltage of 198 kW three-phase load with cos FI=0,99 and current 215A?
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Pathfinder Tags: electrical engineering question electrical question electrical voltage
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SolarEagle
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#1

Re: Voltage

10/31/2013 10:35 AM

Is this a test..?....You guess first......then I will....

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Fredski
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#3
In reply to #1

Re: Voltage

10/31/2013 10:37 AM

its homework, no doubt
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JC123
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#5
In reply to #1

Re: Voltage

10/31/2013 10:44 AM

Not a Test SolarEagle! Just need a friendly favor from YOU

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Fredski
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#2

Re: Voltage

10/31/2013 10:35 AM

good question
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JC123
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#4
In reply to #2

Re: Voltage

10/31/2013 10:42 AM

so! what is the answer?
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SolarEagle
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#6
In reply to #4

Re: Voltage

10/31/2013 10:48 AM

amps*volts=watts

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JC123
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#8
In reply to #6

Re: Voltage

10/31/2013 10:49 AM

Is this the answer?
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PWSlack
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#9
In reply to #8

Re: Voltage

10/31/2013 10:50 AM

It's an answer.

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JC123
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#11
In reply to #6

Re: Voltage

10/31/2013 10:55 AM

SolarEagle! Another favor

Please answer this

What is the total capacitance of capacitors connected in series, C1=1214F, C2=2121F ? Result must be INTEGER (without -F-)

pleeeeeeeeeease

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Yahlasit
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#14
In reply to #11

Re: Voltage

10/31/2013 11:12 AM

The last time I checked, the total capacitance for series capacitors was:

C= 1/(1/C1+1/Cn)

in your example:

C= 1/ (1/1214 + 1/2121) = 1/ (.0008237 + 0.0004714) = 1/0.001295 = 772.0821 F

Can't be an integer

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Fredski
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#16
In reply to #14

Re: Voltage

10/31/2013 11:15 AM

the last time, the first time, and the second time you checked too

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SolarEagle
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#15
In reply to #11

Re: Voltage

10/31/2013 11:14 AM
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Paulusgnome
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#20
In reply to #6

Re: Voltage

10/31/2013 3:59 PM

Its an answer, but not a correct one.

Watts = Volts x Amps x PF in an AC circuit.

Of course, being a solar guy, the Eagle hasn't ever had to do any AC calcs so his formula is fine for DC applications.

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Tornado
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#21
In reply to #20

Re: Voltage

10/31/2013 4:02 PM

You forgot √3 for 3-phase.

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Paulusgnome
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#24
In reply to #21

Re: Voltage

10/31/2013 4:29 PM

Woops, so I did. I stand corrected.

Type in haste and repent at leisure.

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Fredski
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#22
In reply to #20

Re: Voltage

10/31/2013 4:03 PM

he never did AC really?
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PWSlack
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#7
In reply to #4

Re: Voltage

10/31/2013 10:49 AM

Don't be a meanie-bum. Offer a prize for getting the right answer!

Anyway - why not just stick a voltmeter on it and ask that instrument instead?

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JC123
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#10
In reply to #7

Re: Voltage

10/31/2013 10:53 AM

Can't , can you do that? Pleeeeeeeeeease

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PWSlack
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#12
In reply to #10

Re: Voltage

10/31/2013 11:05 AM

Just as soon as FedEx (other delivery services are available) gets here with 2*3500 miles of single-conductor voltmeter connector lead.

Presumably it will want a signature?

Oh, and a boat, with supplies and a bed for four nights' Atlantic travel each way while the cables are paid out...

Hang on. Who is paying for all this?

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Yahlasit
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#19
In reply to #10

Re: Voltage

10/31/2013 11:23 AM

It's a little tough to get along in here when you're a newby, but don't quit, be patient, you'll figure how to improve (or adapt) your comunication skills; then it will become a highly rewarding experience, this site is really a pond of wisdom.

Hope to see you often

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IdeaSmith
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#26
In reply to #19

Re: Voltage

01/09/2014 5:15 PM

Charmer!

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JRaef
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#13

Re: Voltage

10/31/2013 11:10 AM

You must be in school to get a degree in management, because rather than figuring out the answer, you are trying to coerce someone more competent to do your work for you.

Good luck with that... And by the way here is a hint for you future as an incompetent manager: highly competent people often resent the kind of arrogance you are displaying, so to get back at you, knowing you will take credit for doing the work yourself, they MIGHT consider giving you the wrong answer!

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JC123
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#17
In reply to #13

Re: Voltage

10/31/2013 11:18 AM

Come on! Its not like that.

Anyhow, thanks for you respond

Good Day!
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lyn
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#25
In reply to #17

Re: Voltage

10/31/2013 7:42 PM

Why don't you just fess up, before I have to out you.
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Fredski
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#18

Re: Voltage

10/31/2013 11:21 AM

a suggestion...try starting off with something that sounds like, "I'm a student working on capacitance formulas and I sure could use a little help working out some simple problems, can anyone with a little spare time offer a little help?" you'll get further and Jaef might even put you on his Xmas card list

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#23

Re: Voltage

10/31/2013 4:14 PM

W = V A √3 cosφ

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Tornado
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#27

Re: Voltage

01/09/2014 5:59 PM

KW = V A √3 cosφ/1000. This can be rearranged and solved. (φ is Greek letter phi.)

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Users who posted comments:

Fredski (5); IdeaSmith (1); JC123 (6); JRaef (1); lyn (1); Paulusgnome (2); PWSlack (3); SolarEagle (3); Tornado (3); Yahlasit (2)

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