Mammoth Memory

Most efficient way to transmit 1 KVA

  1000 volt and 1 Amp equal 1000W

1 volt and 1000 Amp equal 1000W

500 volt and 2 Amp equal 1000W

5 volt and 200 Amp equal 1000W
 


The question becomes which is the most efficient way to send power (voltage and current) down a wire.

Power lines have losses when heat is generated in them by electric current moving through the wires. There is a loss of power down the length of the wire.

 

Example 1

  Double the voltage  
     
  halves the current  
     
  The power loss decreases by `2^2=4`  


Or another way of saying this

  Increase the voltage by a factor of  `2`  
     
  decreases the current by a factor of  `2`  
     
  The power loss decreases by `2^2=4`  

 

Example 2

 

  Increase the voltage by a factor of  `100`  
     
  decreases the current by a factor of  `100`  
     
  The power loss decreases by `100^2=10,000`  

 

So there are massive advantages for sending high voltage over long distances in a wire.

HIGH VOLTAGE = LOWER ENERGY LOSSES


Which equals thinner cables needed.

Transformers allow the use of thinner cables.

 

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