× Didn't find what you were looking for? Ask a question
Top Posters
Since Sunday
o
6
6
G
3
c
3
q
3
m
3
j
3
s
2
b
2
j
2
u
2
j
2
Home Q & A Board Science-Related Homework Help High School Level Science
New Topic  
astuckey astuckey
wrote...
Posts: 20
Rep: 0 0
5 years ago
A 100 MW power station generates energy at 26.0 kV.  The power lines must carry only 200 A of current to be efficient enough.  To what voltage must the potential be increased?
Show your work (formula, substitution, answer rounded correctly and with the appropriate unit).
Read 245 times
1 Reply

Related Topics

Replies
wrote...
#1
Educator
5 years ago
power = voltage \(\times \) current

\(P=VI\)

We are told the power (100MW = 100x10⁶ W)

We are told the current we want (I = 200A)

So we can find the voltage we want

Rearrange the formula to get V isolated

V = P/I

Put the value in

V = 100x10⁶ / 200

V = 5 x10⁵ V

If you want the answer in kV, divide by 1000

V = 500kV

(The value of 26.0kV is not needed here.)
New Topic      
Quick Reply
Explore
Post your homework questions and get free online help from our incredible volunteers
  1126 People Browsing
Start New Topic Take the Tour CoursesNew Study Tools Topics Trending Browse by Textbook
Live Chat
Related Images
  
 472
  
 248
  
 303
Your Opinion
Where do you get your textbooks?
Votes: 447
Previous poll results: Which industry do you think artificial intelligence (AI) will impact the most?