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29 March, 13:52

A transformer has a primary voltage of 115 V and a secondary voltage of 24 V. If the number of turns in the primary is 345, how many turns are in the secondary? A. 8 B. 690 C. 72 D. 1,653

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  1. 29 March, 14:21
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    C. 72

    Explanation:

    Transformer: A transformer is an electromagnetic device that uses the property of mutual inductance to change the voltage of alternating supply.

    In a ideal transformer,

    Vs/Vp = Ns/Np ... Equation 1

    Where Vp = primary voltage, Vs = secondary voltage, Ns = Secondary turn, Np = primary turn.

    Making Ns the subject of the equation,

    Ns = (Vs/Vp) Np ... Equation 2

    Given: Vs = 24 V, Vp = 115 V, Np = 345.

    Substitute into equation 2

    Ns = (24/115) 345

    Ns = 72 turns.

    Thus the number of turns in the secondary = 72 turns.

    The right option is C. 72
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