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    Parameters of a Transformer

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    An ideal step-down transformer is used to convert the AC voltage from the power line at 120V to 5.0V in an adapter for your laptop computer.
    (a) The primary coil has 2000-turns, how many turns are in a secondary coil?
    (b) If the average power consumption of your laptop is 80W, what is the average current in the primary coil and the current I in the secondary coil?
    (c) What is the load resistance R in the secondary coil? Assume that it is an ideal transformer.

    © BrainMass Inc. brainmass.com December 24, 2021, 11:48 pm ad1c9bdddf
    https://brainmass.com/physics/applied-physics/parameters-transformer-603663

    SOLUTION This solution is FREE courtesy of BrainMass!

    Vp = 120 Volt
    Vs = 5 Volt

    a.
    Np = 2000 turns
    Ns = (VS/Vp)*Np = (5/120)*2000 = 83 (nearest integer value)

    b.
    Power, P = 80 W
    Primary current
    I1 = P/Vp = 80 / 120 = 2/3 Amp = 0.67 Amp

    Secondary current,
    I2 = P/Vs = 80/5 = 16 Amp

    c.
    P = I2^2 R
    => R = P/I2^2 = 80 / 16^2 = 0.3125 ohm.

    This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here!

    © BrainMass Inc. brainmass.com December 24, 2021, 11:48 pm ad1c9bdddf>
    https://brainmass.com/physics/applied-physics/parameters-transformer-603663

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