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Alternating Current has its advantage over Direct Current because?

 
 
Reply Fri 17 Apr, 2015 07:01 pm
Alternating Current has its advantage over Direct Current because?

a. Capable of a wider variety
b. Cheaper to produce
c. More easily measured
d. More efficiently transmitted?
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Type: Question • Score: 2 • Views: 667 • Replies: 9
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dalehileman
 
  1  
Reply Sat 18 Apr, 2015 02:38 pm
@mars2010,
Mainly,'cause it's so easy to step up or step down
roger
 
  1  
Reply Sat 18 Apr, 2015 02:41 pm
@dalehileman,
And generator brushes last longer on slip rings.


Haven't really helped with the multiple choice, have we Dale?
dalehileman
 
  1  
Reply Sat 18 Apr, 2015 03:39 pm
@roger,
Quote:
And generator brushes last longer on slip rings.
Ah yes Rog, of course

Quote:
Haven't really helped with the multiple choice, have we Dale?
Not just a whole lot
0 Replies
 
dalehileman
 
  1  
Reply Sat 18 Apr, 2015 04:47 pm
@mars2010,
https://www.google.com/?gws_rd=ssl#q=advantages+ac+over+dc
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georgeob1
 
  1  
Reply Sat 18 Apr, 2015 05:02 pm
@mars2010,
I'm not sure there is anything about AC current or voltage that is more easily measured than DC. Neither am I persuated AC is any cheaper to produce (ie. generate froim mechanical energy). (Unloaded DC generators do have their problems though.)


However the lower line losses are certainly a siugnificant advantage to AC and it is far easier to rectify AC signals to produce DC at high powrer levels than it is to procuce AC power from DC, If that is what you mean by greater variety, then I agree.
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Olivier5
 
  1  
Reply Sat 18 Apr, 2015 05:36 pm
@mars2010,
1. Easier to produce via turbines.
2. Safer, as you won't get 'stuck' to an AC wire when you touch it, but you could on a DC one.
georgeob1
 
  1  
Reply Sat 18 Apr, 2015 06:50 pm
@Olivier5,
Any rotsating machine csan drive an AC or a DC generator wiih equal ease.Turbo generators producing AC aere indeed ubiquitous, but that is becsuse of Westinghouse's triumph over Edison/GE and the relatively lower line losses associayted with AC,
contrex
 
  1  
Reply Sun 19 Apr, 2015 07:47 am
For new lines, beyond the ‘break-even’ distance, HVDC transmission systems cost less, even with the added expense of terminal stations. An HVDC line has lower power losses than an HVAC of the same capacity in practically all cases, which means more power is reaching its final destination. Also, by converting an ac line to dc, it may be possible to raise the power transfer capability of an existing transmission corridor. HVDC may be the most cost effective solution for long distance bulk power transfer.

http://new.abb.com/systems/hvdc/why-hvdc/economic-and-environmental-advantages
0 Replies
 
Olivier5
 
  1  
Reply Sun 19 Apr, 2015 08:16 am
@georgeob1,
I don't think so. Aren't induction generator aka dynamos the simplest device to produce electricity? And don't they profuce AC?

The safety aspect is also significant. Irrespective of what the grid uses, domestic connections must be in AC for safety reasons.
0 Replies
 
 

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