Figure shows a D C voltage regulator circuit, with a Zener diode of breakdown voltage = 6 V . If the unregulated input voltage varies between 10 V to 16 V , then what is the maximum Zener current?

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Current through 2 K Ω is i = 10 2000 = 5 m A Current through 4 K Ω i L = i - i z = 6 4000 = 1.5 m A ⇒ i z = i - 1.5 ∴ i z = 5 - 1 .5 = 3 .5 mA

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