Suppose a company delivers 540kW of power at 12kV thru wires that have a total resistance of 2.5 ohms. How much power is saved by delivering the power at 87kV rather than 12kV?
I read in my textbook that {power lost due to heat} is proportional to R*I^2. I also know how to get the right answer. I just don't know why (I messed around with the numbers and somehow got the right answer).
The procedure to get the right answer is:
P = IV (what does P represent here?-power from where?)
(540kW) = I (12kV)
I = 45 A for the delivery at 12kV
Then: P = I^2*R = (45^2)(2.5) = 5062.5
Another question here: what does this P represent? Why are there 2 "P's" in the problem?
Repeat procedure for 87kV
P = IV
Solve for I.
Then: P = I^2*R = 96 A
Then the correct answer is obtained by subtracting:
5063 - 96 = 4967 = 4970 W
They give the answer as 4.97 kW.
2007-05-27 14:21:55 · 4 answers · asked by J Z 4 in Physics
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2007-05-27 14:21:50 · 4 answers · asked by m 1 in Mathematics
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2007-05-27 14:21:25 · 10 answers · asked by Anonymous in Fashion & Accessories
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Peace.
2007-05-27 14:21:22 · 9 answers · asked by Anonymous in Religion & Spirituality
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Whenever someone calls me either I say thank you.
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2007-05-27 14:20:43 · 6 answers · asked by M 7 in Corporations
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2007-05-27 14:20:37 · 3 answers · asked by animallovingirl77 1 in Video & Online Games
green toothpaste
2007-05-27 14:20:30 · 30 answers · asked by suzie2 1 in Polls & Surveys
okay my boyfriend has had a...tendancy to flirt and hit on other girls while he is dating me, and aperently him and my friend are "friends with benifits" but he doesnt seem to think thats cheating...i love him but i cant trust him, and i dont want him if i cant be his only one.
please, what should i do! HELP!!!
2007-05-27 14:20:27 · 10 answers · asked by stephanie m 1 in Singles & Dating
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2007-05-27 14:20:17 · 17 answers · asked by nuthnbettr2do0128 5 in Religion & Spirituality
!)have a moment of silence for our deceased veterans
2)say a prayer for our soldiers and their families
3)just be grateful we live in the great U.S.A.
4)add your own
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A blonde calls her boyfriend and says,
'Please come over here and help me.
I have a killer jigsaw puzzle, and I can't
figure out how to get it started.'
Her boyfriend asks, 'What is it supposed
to be when it's finished?'
The blonde says, 'According to the picture
on the box, it's a tiger.'
Her boyfriend decides to go over and help
with the puzzle. She lets him in and shows
him where she has the puzzle spread all over
the table.
He studies the pieces for a moment, then
looks at the box, then turns to her and says,
'First of all, no matter what we do, we're
not going to be able to assemble these pieces
into anything resembling a tiger.'
He takes her hand and says, 'Second, I
want you to relax.
Let's have a nice cup of tea, and then....'
He sighed..............'Let's put all the
Frosted Flakes back in the box..'
Life is not measured by the number of breaths we take, but by the moments that take our breath away.
2007-05-27 14:19:26 · 23 answers · asked by Anonymous in Jokes & Riddles
Stop saying o ya that like Zac Efron is gay and why is Ashley Tisdale such a show off leave people alone like people say ya Zac Efron is gay and stuff how do you know leave people alone i am not saying ya your friends are gay or show offs so leave them alone they have a life too
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We need more people in our world who beleive in a promote peace, equality, and exceptance, like him!
Don't you agree?
If everyone in the world agreed with and did what the song Imagine said, we would live in a place with peace and love and, as it goes,
"nothing to kill or die for"
If thats not perfection....................
and John Lennon wrote that song
2007-05-27 14:19:01 · 10 answers · asked by shouting is better 3 in Other - Music
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2007-05-27 14:18:54 · 16 answers · asked by LAgirl 3 in Preschool
♥
its the best, right!!
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