The most efficient way to channel electricity power from the power station.
Question:

Look at the map. See  the power station “orot rabin”.

See the diagrams of the power station.  

The electrical current flows from the power station to the consumers through electric cables.

The electrical current leaves the power plant with a voltage as high as 750,000 volts

 At the substation transformer the voltage is lowered to about 2000 - 13000 volts

At the farthest transformer (near the customer)  the voltage is lowered again to  120 or 240 volts

Watch the simulation of Ohms-law and note any changes in the current.  Remember what you learned about Ohms-law.


Watch the simulation of circuit-kit-DC and note any changes in the power change.  Remember what you learned about the power of the electricity circuit.

http://phet.colorado.edu/en/simulation/legacy/circuit-construction-kit-dc

We learned that the power of an electrical circuit depends on the voltage and the current. In fact the power formula is: P=VI=RI2

What is the most  efficient way to channel the electricity power from the power station?



0 People tried to answer this question

Raise the voltage as high as possible, so as to minimize the current (per unit of power), in order to reduce power loss.

The electricity power should be channeled from the power station should go through a lot off electrical insulation, to reduce power loss.

Minimize the distance from the power station to the customer, so we have to replace the cotstomer. The shorter the distance, the bigger the loss.

The electricity current, which is channeled from the power station, does not match the Ohm's Law. So any change in the cable will not affect loss.



Comments:
1.  ULIEL MICHAL (2011-12-20 15:00:00)
michal uliel- commet
Hi Narda!
There is a connection between the question and the informatin you have put. 
I don't think the power station video is necessary. 
The information helps to understand better,
I think the question is a bit too hard to understand at first for middle school students.

2.  Awwad Safaa (2013-12-20 15:00:00)
FeedBack

Hi Narda,

 

I like your question , I would like to recommend you a few things

first of all i recommend to replace the diagram of the power station with this English diagram :

  1. Steam is generated at the electricty plant by the burning of fossil fuels – or at a nuclear or hydroelectric plant.
  2. The steam powers a turbine which spins a huge magnet inside a copper wire. Heat energy converts to mechanical energy which then converts to electrical energy in the generator.
  3. Elecricity flows from the power plant through wires to the step up transformer. The transformer raises the pressure so it can travel long distances – its raised as high as 756,000 volts
  4. The electric current then runs through the power lines to the substation transformer where pressure is lowered to between 2000 and 13000 volts
  5. Electricity is then taken through the lines to a pole transfomer – or a transformer box if underground – and pressure is lowered again to between 120 and 240 volts
  6. From here electricity comes into your home through a service box, where your meter is located to measure how much you use. Wires take electricty around your home powering your lights and all your other appliances

Science Diagram 



Also I felt that the question need a little bit arrangement, I can see two simulation , one picture and one video that is too much in the way you put them and for understanding the question.

The simulation of Ohms-law helped me to understand more.

At last I can recommend to you another link on the map :

Germany : Georg Ohm - Georg Simon Ohm (German: [oːm]; 16 March 1789 – 6 July 1854) was a German physicist and mathematician. As a school teacher, Ohm began his research with the new electrochemical cell, invented by Italian scientist Alessandro Volta. Using equipment of his own creation, Ohm found that there is a direct proportionality between the potential difference (voltage) applied across a conductor and the resultant electric current. This relationship is known as Ohm's law.


Georg Simon Ohm3.jpg

Good Luck

Safaa




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