Circuit Theorems in AC Analysis

Referring to the given circuit, find Z_TH for the part of the circuit that is external to R_L.

A 129

21.4°

B 43.7

68.6°

C 43.7

21.4°

D 12.9

68.6°

ANS:B - 43.768.6°

Here, R1 and XL are in parallel. So, the Equivalent resistance is calculated based on the formula (R1*XL)/(R1+XL).

= (120*47j)/(120+47j) = 43.7 < 68.6 ohms.

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