4 Please help me answer this question Item 4 Assume a voltage source supplies an

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4 Please help me answer this question

Item 4 Assume a voltage source supplies an ac voltage of amplitude Vo between its output terminals. If the output terminals are connected to an external circuit, and an ac current of amplitude 10 flows out of the terminals, then the equivalent resistance of the external circuit is R eq =Vo/Io Part A If a resistor R is connected directly to the output terminals, what is R eq ? Express your answer in terms of the variables R. Part B If a transformer with Np and Ns turns in its primary and secondary, respectively, is placed between the source and the resistor as shown in the figure, what is Req ?(figure 1 [Transformers can be used in ac circuits to alter the apparent resistance of circuit elements. such as loud speakers, in order to maximize transfer of power.] Express your answer in terms of the variables N, N, and R.

Explanation / Answer

Part A.

It would just be

Req = R [ANSWER, PART A]

*********************

Req would be

Req = (Np / Ns) R [ANSWER, PART B]

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