In a Zener diode voltage regulator circuit, what is the purpose of the series resistor ( Rs)
connected between the input voltage source and the Zener diode?
-
A.
To drop the excess voltage and regulate the output
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B.
To filter out noise and ripples in the input voltage
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C.
To limit the current through the Zener diode
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D.
To increase the voltage rating of the Zener diode
Correct Answer:
C. To limit the current through the Zener diode
Explanation:
In a Zener diode voltage regulator circuit, the series resistor (Rs) serves the critical function of limiting the current that flows through the Zener diode. Because a Zener diode has very low resistance once it reaches its breakdown voltage, connecting it directly to a voltage source would allow excessive current to flow, leading to overheating and permanent damage. The resistor ensures the diode operates within its safe power rating while also dropping the difference between the input source voltage and the stabilized Zener voltage, thereby enabling effective voltage regulation.
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