When a 1 $\mathrm { k } \Omega$ load resistor is connected across the secondary winding of a transformer with a turns ratio of 2: 1 , the source "sees" a reflected load of________
A) 4 $\mathrm { k } \Omega$
B) 500$\Omega$
C) 2 $\mathrm { k } \Omega$
D) 1 $k \Omega$

Question

When a 1 $\mathrm { k } \Omega$ load resistor is connected across the secondary winding of a transformer with a turns ratio of  2: 1 , the source "sees" a reflected load of________
A) 4 $\mathrm { k } \Omega$
B)  500$\Omega$
C) 2 $\mathrm { k } \Omega$
D) 1 $k \Omega$

Quizplus · Accepted Answer

The reflected load $Z_{ref}$ seen by the source in a transformer is related to the actual load $Z_{load}$ and the turns ratio $n$ (primary to secondary) by the formula $Z_{ref} = Z_{load} \cdot n^2$. With a turns ratio of 2:1 and a load of $1 k\Omega$, the reflected load is $1 k\Omega \cdot 2^2 = 4 k\Omega$.

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