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Electronics and electicals

  1. Jan 29, 2009 #1
    Plz answer these questions. Need them urgently

    1. How does Metro Rail work? The Electrical Description about how the Potential Difference is created?
    2. What is the significance of direction of current? How is it found for AC Current?
    3. How can you identify – live (or phase), earth and neutral wires out of three same colour wires provided to you?
    4. Name the substance whose resistance doesn’t change with change in Temperature.
    5. What is the physical significance of current source?
    6. How can a bird sit on a high tension wire without getting any shock?
    7. 3 phase system working principle.
    8. What is the difference b/w phaser and vector diagram?
    1. The problem statement, all variables and given/known data

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Jan 29, 2009 #2


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    Science Advisor

    Where is your attempt?

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