Consider the following statements (A) and (B) and identify the correct answer.
(A) A zener diode is connected in reverse bias when used as a voltage regulator.
(B) The potential barrier of the p-n junction lies between 0.1 V to 0.3 V.
(A) A zener diode is connected in reverse bias when used as a voltage regulator.
(B) The potential barrier of the p-n junction lies between 0.1 V to 0.3 V.
(A) is incorrect but (B) is correct
(A) and (B) both are correct
(A) and (B) both are incorrect
(A) is correct and (B) is incorrect
The Correct Option is D
Solution and Explanation
To determine the correct answer, let's analyze the given statements (A) and (B) in the context of electronic components, particularly focusing on the Zener diode and p-n junction diodes.
- Understanding Statement (A): "A Zener diode is connected in reverse bias when used as a voltage regulator."
- Zener Diode Operation: A Zener diode is designed to allow current to flow in the reverse direction when a specific reverse voltage, known as the Zener voltage, is reached.
- Application: This property is utilized for voltage regulation in circuits. When the reverse bias voltage across the diode exceeds the Zener voltage, the Zener diode maintains a stable output voltage.
- Hence, statement (A) is correct because a Zener diode indeed functions as a voltage regulator when connected in reverse bias.
- Understanding Statement (B): "The potential barrier of the p-n junction lies between 0.1 V to 0.3 V."
- Potential Barrier: The potential barrier for a typical silicon p-n junction diode is approximately 0.7 V, while for a germanium diode it is approximately 0.3 V.
- Therefore, the potential barrier range of 0.1 V to 0.3 V specified in statement (B) is incorrect for standard silicon and germanium diodes.
Considering the analysis above, the correct answer is "(A) is correct and (B) is incorrect." Statement (A) accurately describes the operation of a Zener diode as a voltage regulator in reverse bias, whereas statement (B) incorrectly states the range for the potential barrier of a typical p-n junction.
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Concepts Used:
Applications of diode
Diodes are used in many applications. By removing the signal component, several of them convert AC current to DC current also are known as rectifiers when used in this position. Diodes act as electric switches and can block voltage spikes, making them ideal for surgical protectors. They are hired to do digital logic. Some things are made from diodes such as power supply and voltage doubles. The sensors, as well as light on lighting devices and lasers, depend on LEDs. For electronic tuning, varactors are used, and for compressing transients in AC lines varistors are used. Zener diodes are used as voltage regulators where varactors are used for electronic tuning, and varistors are used for compressing transients in AC lines.
On the base of diodes, transistors and op-amps are built. The most common diode mode is the p-n junction. One (n) object with electrons as the charging conductor closes the second object (p) with holes (well-charged particles acted as depleted areas of electrons) as the charge carriers on this type of diode. Where they connect, the narrowing space forms, where electrons are dispersed to fill holes in the p-side. This effectively stops the flow of electrons. When a positive voltage is given to the p-side of this junction, electrons may easily move from it and the current flows into the diode to fill the holes. The shrinkage area expands as the negative bias interacts (i.e., negative voltage is given to the p-side), making the electrons harder to move across.