Consider a step-down transformer with 15 turns in the primary and 6 turns in the secondary windings. Calculate the input impedance of this transformer loaded to an 8 Ω resistor, assuming that series resistances of the windings are negligible.

Input impedance of this transformer is 50 ohms.  

Explanation:

Given that,

Number of turns in the primary coil,

Number of turns in the secondary coil,

Output impedance of the transformer,

The number of turns and the impedance ratio in the step down transformer is given by :

So, the input impedance of this transformer is 50 ohms. Hence, this is the required solution.

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