Question

A p-n junction diode without any voltage biasing acts as:

• A. rectifier
• B. resistor
• C. ac generator
• D. voltage regulator
• E. transformer

Hint:

Biasing is required for a diode to perform its primary function as a rectifier.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
This question asks about the behavior of a p-n junction diode when no external voltage (bias) is applied. We need to understand the function of a diode and how it differs from other electronic components.
Step 2: Detailed Explanation:
Let's analyze the components and their functions: - p-n Junction Diode: A semiconductor device that allows current to flow primarily in one direction (when forward-biased) and blocks current in the opposite direction (when reverse-biased). - Rectifier: A device that converts alternating current (AC) to direct current (DC). This requires applying an AC voltage across the diode; it doesn't describe the diode's behavior with no bias. - Resistor: A passive electrical component with a specific electrical resistance. It opposes the flow of current. When a p-n junction is unbiased, a depletion region forms at the junction. This region has a high resistance and opposes the flow of charge carriers. Therefore, an unbiased diode presents a certain (high) resistance to any potential current flow. While its resistance is not constant like an ideal resistor (it's non-ohmic), its primary characteristic in the absence of a significant bias voltage is to resist current flow. - AC Generator: A device that produces alternating current. - Voltage Regulator: A device that maintains a constant output voltage. Zener diodes can be used as voltage regulators, but this requires them to be reverse-biased in their breakdown region. - Transformer: A device that transfers electrical energy from one AC circuit to another, often changing the voltage level. With no voltage biasing, the diode is not performing any active function like rectification, generation, or regulation. It is simply a passive component. Due to its internal depletion region, it possesses a very high resistance. Therefore, it acts as a resistor (specifically, a non-linear one with high resistance).
Step 3: Final Answer:
A p-n junction diode without any voltage biasing acts as a resistor.