In the voltage regulator circuit in Figure P2.21, (V_{I}=20 mathrm{~V}, V_{Z}=10 mathrm{~V}), (R_{i}=222 Omega), and (P_{Z}(max )=400

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In the voltage regulator circuit in Figure P2.21, \(V_{I}=20 \mathrm{~V}, V_{Z}=10 \mathrm{~V}\), \(R_{i}=222 \Omega\), and \(P_{Z}(\max )=400 \mathrm{~mW}\).

(a) Determine \(I_{L}, I_{Z}\), and \(I_{I}\), if \(R_{L}=380 \Omega\).

(b) Determine the value of \(R_{L}\) that will establish \(P_{Z}(\max )\) in the diode.

(c) Repeat part (b) if \(R_{i}=175 \Omega\).

Figure P2.21:-

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