Consider the zener diode circuit shown in the figure below:

The value of zener breakdown voltage is equal to $V_{z} = 10 V$ and the maximum current that should flow through the zener diode is $I_{z m} = 32 m A$ , then which of the following graph represents the load characteristic of the circuit.

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Solution

The correct option is A
The minimum value of $R_{L}$ is equal to
$R_{L m i n} = \frac{R V_{z}}{V_{i} - V_{z}} = \frac{1 \times 10^{3} \times 10}{5 - 10} = 250 Ω$ and $I_{R} = \frac{50 - 10}{1 k Ω} = 40 m A$
$∴ I_{L (m i n)} = 40 - 32 = 8 m A$ and $I_{L (m a x)} = \frac{V}{R_{L (m i n)}} = \frac{10}{250} = 40 m A$

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