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Anonymous Poster

amount of energy produced from water falling

10/17/2009 9:47 AM

how many watts of energy would be produced if 1 kg of water fell 50 meters onto a turbine that is 90 percent efficent.

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Guru

Join Date: Mar 2007
Location: City of Light
Posts: 3943
Good Answers: 183
#1

Re: amount of energy produced from water falling

10/17/2009 10:57 AM

The Watt is a power unit = joule/s= 1Nm/s If you use the word Energy you should use the units Joule or Watt*s. Any way the answer is -for earth where 1 kg of water (mass) has a weight of 9.81 N will be = 9.81*50*0.9=441.45 Nm or Joule or Watt*s.

There are different languages the one on the street or on the market as on of the aprticipants said and the one of the profession. In the frame of a professional discussion -if we raee professionals of course- we should use the language of the profession and on the street the street one which could be different.

In the international unit system the defnitions are:

mass - kg

force - N which is the force giving to a 1kg mass an acceleration of 1m/s²

energy - Nm called also Joule

power - Watt defined as 1 joule/s

International standards have been developed for international communication and understanding between far away living people.

CR4 is an example of such communication so that we should make the effort not to use the language of every street which different from town to town even within a single country but a language which is worldwide valid and avoids misunderstandings.

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Participant

Join Date: Oct 2009
Posts: 4
#2
In reply to #1

Re: amount of energy produced from water falling

10/17/2009 12:41 PM

thanks for answering my question.

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Participant

Join Date: Oct 2009
Posts: 4
#3

Re: amount of energy produced from water falling

10/17/2009 12:54 PM

sorry i am not even out of school so i am not exactly professional but thanks for the hint.

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Commentator

Join Date: May 2009
Location: Mumbai
Posts: 73
#4

Re: amount of energy produced from water falling

10/17/2009 3:02 PM

I can give u a exact formula for Hydro system :

P = (Flow x Head X 9.81 X Eff. of Turbine X Eff. Of Generator)

where, P= Generated power in KW

Flow= flow in m3/sec

Head = Net height in meter

may be it will be useful to you

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Participant

Join Date: Oct 2009
Posts: 4
#5
In reply to #4

Re: amount of energy produced from water falling

10/17/2009 3:19 PM

thank you.

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Guru
Hobbies - Musician - Tube Amps Only Please!

Join Date: Apr 2009
Location: Los Angeles, California USA
Posts: 553
Good Answers: 1
#6

Re: amount of energy produced from water falling

10/17/2009 10:15 PM

Read up on Hoover Dam generation plant.

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Anonymous Poster
#7

Re: amount of energy produced from water falling

10/19/2009 10:38 AM

Sounds like a homework question.

Think gravitational potential energy.

Use conversion facttors to convert from Energy in type to energy out type.

Apply the efficiency factor and you are done

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Participant

Join Date: Oct 2009
Posts: 4
#8
In reply to #7

Re: amount of energy produced from water falling

10/19/2009 12:55 PM

thanks for the help actually its just an interest i have.

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Anonymous Poster
#9

Re: amount of energy produced from water falling

10/20/2009 1:39 PM

Is the water falling drop by drop or is it contained in a blader? Perhaps continuous flow?

Yet if the 1kG of force acts on 50 m it produces 50 kGm of energy, but power is energy release in time, so what is the time of energy release?

Answer these and I would tell you what is the power output!

but to satisfy you without answers I say infinit power as time of contact of water with surface is zero and that is the power of water that curves our land producing canyons and moving mountains

Kazik

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