Discussion
Assertion (A): Assertion: A Zener diode can regulate without a series resistor.
Reason (R): Reason: Its voltage is nearly independent of the current through it.
Select the correct answer from the options below.
Answer: A
The reason is true and is exactly why the assertion is false: because the voltage barely changes with current, nothing inside the diode limits that current, and something in series must. Without the resistor the diode is destroyed as soon as breakdown begins. A steep characteristic is what makes a good reference and what makes external current limiting mandatory, so the two facts are two faces of one property. Framing the question as which quantity the change acts upon makes the answer follow without calculation.
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