A large power plant generates electricity at 12.0 kV. Its old transformer once converted the voltage

A large power plant generates electricity at 12.0 kV. Its old transformer once converted the voltage to 390 kV. The secondary of this transformer is being replaced so that its output can be 515 kV for more efficient cross-country transmission on upgraded transmission lines. (a) What is the ratio of turns in the new secondary compared with turns in the old secondary

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  1. 1.32 is the turns ratio

    Explanation:

    Note that The transformer steps up the voltage from 12000 V to 390000V

    12000 V is the primary and in the secondary it is 390000 V in old transformer

    If n₁ be no of turns in primary coil and n₂ be no of turns in secondary coils

    the formula is

    n₂ / n₁ = voltage in secondry / voltage in primary

    n₂ / n₁ = 390000 / 12000

    ratio of turns in old transformer is 32.5

    ratio of turns in new transformer

    n₃ / n₁ = 515 / 12 ( n₃ is no of turns in the secondary of new transformer )

    = 42.9

    T he ratio of turns in the new secondary compared with the old secondary

    n₃ / n₂ = 42.9 / 32.5

    = 1.32

  2. Multiply the 3 dimensions, assuming it is a rectangular cuboid, to get the volume in cm³ divide mass by volume to get density in g/cm³

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