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  1. To step 110 V ac down to 20 V ac, the turns ratio must be

    2. A.
    5.5
    B.
    18
    C.
    0.18
    D.
    0.018

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    Answer : Option C

    Explanation :

    Vp/Vs = Np/Ns

    Vs = (Ns/Np)Vp

    We required turns ratio i.e., (Ns/Np)

    = Vs/Vp

    = 20/110

    = 0.181818182

    [Note: p - primary; s - secondary]

    For step down transfer, the turns ratio will be less than 1.

    For simulation: Step-Down Transformer Circuit Simulator.

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