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Discussion :: Network Analysis and Synthesis

  1. An RL series circuit has an impedance of 20 Ω when frequency is 25 Hz. At f= 50 Hz, the impedance will be

    2. A.
    40 Ω
    B.
    20 Ω
    C.
    less than 40 W but more than 20 Ω
    D.
    less than 20 W but more than 10 Ω

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    Answer : Option C

    Explanation :

    Z = R2 + XL2. When frequency is doubled, XL becomes twice but R remains the same.

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