$$\text { Figure } 14

Question

$$\text { Figure } 14 < 1$$ -What is the reflected resistance seen by the primary in Figure 14-1 if the turns ratio is 3: 1 and I_S is 240 mA ? A) 9000 $\Omega$ B) 1500$\Omega$ C) 167$\Omega$ D) 500 $\Omega$

Quizplus · Accepted Answer

The reflected resistance ($R_{ref}$) seen by the primary of a transformer can be calculated using the formula $R_{ref} = R_{load} \times (N_1/N_2)^2$, where $N_1/N_2$ is the turns ratio. Given the turns ratio is 3:1, and assuming the resistance given by "I_S" (which seems to be a typographical error or a code) refers to the load resistance or is related to the calculation in a way that leads to a resistance of 500 $\Omega$ (since none of the provided choices directly relate to the given current value without additional context or calculation steps), the reflected resistance would be $500 \times (3/1)^2 = 500 \times 9 = 4500 \Omega$. However, since 4500 $\Omega$ is not an option and there might have been a misunderstanding in the interpretation of the given information or a mistake in the calculation explanation without the correct context, the closest correct choice based on standard transformer reflection principles and the provided options would be 1500 $\Omega$, assuming a direct relationship or a calculation error in the explanation. This answer is chosen based on the available options and the understanding that there might be a misinterpretation of the provided data or a typo in the question.

Figure 14<1\text { Figure } 14 < 1 Figure 14<1 -What Is the Reflected Resistance Seen by the Primary in the Reflected

$\text { Figure } 14 < 1$ -What Is the Reflected Resistance Seen by the Primary in the Reflected