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Q: electical supply systems ( Answered,   0 Comments )
Question  
Subject: electical supply systems
Category: Reference, Education and News > Homework Help
Asked by: stephenj8a-ga
List Price: $3.00
Posted: 12 Nov 2006 12:58 PST
Expires: 12 Dec 2006 12:58 PST
Question ID: 782153
what is the purpoes of transmitting electricity at high voltage
Answer  
Subject: Re: electical supply systems
Answered By: denco-ga on 12 Nov 2006 13:44 PST
 
Howdy stephenj8a-ga,

The purpose to try to offset that pesky ol' resistance.

Wikipedia, the free encyclopedia - Electric power transmission
http://en.wikipedia.org/wiki/Electric_power_transmission

"It is necessary to transmit the electricity at high voltage to reduce the
fraction of energy lost. For a given amount of power transmitted, a higher
voltage reduces the current and thus the resistive losses in the conductor.
Long distance transmission is typically done with overhead lines at voltages
of 110 to 1200 kV."

The following is some text from a University of Virginia "slide show" on the
topic, and which charts the process.
http://howthingswork.virginia.edu/lecture%20slides/electric%20power%20distribution.pdf

"...
Power Transmission
= Power delivered to a city is:
power delivered = current  voltage drop
= Power wasted in transmission wires is:
power wasted = resistance  current2
= For efficient power transmission:
? Use low-resistance wires (thick, short copper)
? Use low current and high voltage drop
..."

If you need any clarification, please feel free to ask.


Search strategy:

Google search on: electricity transmission "high voltage"
://www.google.com/search?q=electricity+transmission+%22high+voltage%22

Looking Forward, denco-ga - Google Answers Researcher

Clarification of Answer by denco-ga on 12 Nov 2006 13:49 PST
Apologies, but:

"The purpose to try to offset that pesky ol' resistance."

should have read:

"The purpose is to try to offset that pesky ol' resistance."
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