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Magazine Chapter 19: Problem 2641
Zener diode is used as (A) Full. wave rectifier (B) amplifier (C) A.C. voltage regulator (D) D.C. voltage regulator
Short Answer
Expert verified
The correct application of a Zener diode is as a \( (D) \) D.C. voltage regulator.
Step by step solution
01
Recall the primary function of a Zener diode
A Zener diode is a type of diode designed to work in the breakdown region or reverse-bias. It allows current to flow in the reverse direction when the voltage across its terminals exceeds the Zener voltage. The main function of a Zener diode is to maintain a constant voltage across its terminals.
02
Analyze each option for the usage of Zener diode
(A) Full wave rectifier - A full wave rectifier is used to convert an alternating (AC) voltage to direct (DC) voltage. A Zener diode is not typically used for this purpose, as it does not offer the necessary rectification properties.
(B) Amplifier - An amplifier is a device that increases the amplitude of a signal. A Zener diode is not suitable for this application, as it does not provide amplification.
(C) AC voltage regulator - An AC voltage regulator is a device used to maintain a constant output voltage in an AC circuit. While the Zener diode can maintain constant voltage under reverse-bias conditions, it is not designed to regulate AC voltage.
(D) DC voltage regulator - A DC voltage regulator is a device used to maintain a constant output voltage in a DC circuit. A Zener diode can be utilized in this application because it maintains a constant breakdown voltage, making it an appropriate device for regulating DC voltage.
Based on the analysis above:
03
Choose the correct application
The correct application of a Zener diode is as a (D) D.C. voltage regulator.
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
D.C. voltage regulator
A Zener diode serves as an excellent device for working as a D.C. voltage regulator in electronic circuits. Its primary role in this function is to maintain a stable output voltage, even when there are variations in the input voltage or load conditions.
- Stability: By working in the reverse-bias mode, a Zener diode can clamp the voltage at a predetermined level, preventing it from fluctuating. This feature is crucial for sensitive electronic components that require a stable voltage supply.
- Component simplicity: Zener diodes are commonly used due to their straightforward and cost-effective design. They do not require any special additional components to function as a voltage regulator.
- Applications: Zener diodes are widely used in voltage regulation for small power supplies, reference voltages for circuits, and other applications where maintaining a constant voltage is necessary.
Reverse-bias operation
Zener diodes differ from standard diodes in their ability to operate in reverse-bias conditions. The reverse-bias operation is key to their function as voltage regulators.
- Breakdown region: Unlike regular diodes which cease to function effectively when reverse-biased, Zener diodes are intentionally designed to enter a reverse breakdown region. Here, they can conduct current backward while maintaining a constant voltage.
- Zener voltage: Each Zener diode is designed to maintain a specific Zener voltage, which is the point at which the diode breaks down and begins to conduct reverse current. This predetermined voltage is crucial for ensuring voltage regulation.
- Controlled conditions: The reverse-bias operation is controlled, making Zener diodes predictable and reliable in maintaining the desired voltage levels within a circuit.
Constant voltage
The hallmark of a Zener diode is its ability to maintain constant voltage across its terminals. This characteristic is what makes it so valuable in voltage regulation applications.
- Zener effect: The constant voltage attribute is due to the Zener effect, which occurs at the Zener diode's breakdown voltage. When the diode is reverse-biased and the Zener voltage is reached, it creates a constant voltage plateau.
- Voltage clamping: In practice, this means that beyond the Zener voltage, any increase in input voltage does not affect the output voltage, as the excess voltage is absorbed, creating a "clamping" effect.
- Consistency: Whether the input voltage rises above or falls below the set value, the Zener diode adjusts by changing the reverse current flow, keeping the output voltage steady.
