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The sinusoidal ac source in the figure has an rms value of 20/√2 V. Considering all possible values of RL, the minimum value of Rs in Ω to avoid burnout of the Zener diode is ________.

1. 10 Ω
2. 20 Ω
3. 30 Ω
4. 40 Ω

Correct answer: 20 Ω

Solution

The correct option is 20 Ω because it ensures that the Zener diode operates within its safe limits by providing sufficient current regulation, preventing excessive power dissipation that could lead to burnout.

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