Join 60,000+ competitive exam aspirants
or with email
Your Cart
Subtotal₹0
Total₹0
Examoogle • User • info@examoogle.com • EE-2024-8821
Chapter 1 of 12 • Page 1 of 248🔒 Protected PDF • Watermarked
Join 60,000+ competitive exam aspirants
A diode is used as ____.
An amplifier
A rectifier
An oscillator
A voltage regulator
A rectifier
Quick Summary: A semiconductor diode is a two-terminal electronic component that acts as a unidirectional switch. Because it allows current to flow easily in the forward-biased direction while blocking it in the reverse-biased direction, it is primarily used for rectification.
A semiconductor diode is a two-terminal electronic component that acts as a unidirectional switch. Because it allows current to flow easily in the forward-biased direction while blocking it in the reverse-biased direction, it is primarily used for rectification.
I=Is(enkTqV−1) — Shockley diode equation relating current I to applied voltage V
VDC=πVm — Average DC output voltage for a half-wave rectifier
When a diode is forward-biased, the potential barrier at the p-n junction is reduced, allowing charge carriers to cross and conduct current. In reverse bias, the depletion region widens, creating a high-impedance state that prevents current flow. This unidirectional conduction enables the conversion of alternating current (AC) into pulsating direct current (DC).
A diode consists of a P-type and an N-type semiconductor forming a p-n junction.
The 'cut-in' or threshold voltage is typically 0.7V for Silicon and 0.3V for Germanium.
Rectification is the process of converting bidirectional AC to unidirectional DC.
High efficiency in power conversion
Small size and lightweight compared to mechanical converters
Non-linear characteristics causing harmonic distortion
Voltage drop across the diode reduces output efficiency
Power supply units
Signal demodulation
Clipping and clamping circuits
An amplifier typically requires a transistor (BJT or FET).
An oscillator requires an active device with feedback (like a transistor or Op-Amp).
A voltage regulator typically uses a Zener diode, which is a specific type of diode operated in the breakdown region.
B is correct — A diode is primarily used as a rectifier because it facilitates current flow in only one direction.
Always remember that while Zener diodes are used for regulation, the generic 'diode' is most fundamentally defined by its rectification property in basic electronics.