Semiconductors and Electronic Devices for JEE

• n-type: donor impurity, electrons majority; p-type: acceptor, holes majority
• Forward bias reduces the barrier; reverse bias increases it
• A Zener diode in reverse breakdown regulates voltage
• Logic gates: AND, OR, NOT, NAND, NOR and their truth tables

• Full-wave rectifier output frequency = 2 × input frequency
• Zener current I_Z = I_S − I_L
• n_e n_h = n_i²
• NAND and NOR are universal gates

Printable Semiconductors and Electronic Devices formula sheet: formulas, key ideas and traps on one page. Save it as a PDF for offline revision.

• Misreading diode direction in circuits
• Forgetting the 0.7 V drop when the question uses it
• Truth table errors with combined gates

Appears in almost every JEE Main shift. Logic gate questions are among the easiest marks in the paper.

Chapter names follow the current rationalised NCERT textbooks. Read these sections before solving PYQs.

Question. A Zener diode with breakdown voltage V_Z = 6V is used in a voltage regulator circuit. The input voltage varies from 10V to 16V, and a series resistance R = 200Ω is connected. The Zener has a maximum power rating of 0.5W. (a) Find the minimum load resistance R_L for which the Zener maintains voltage regulation. (b) If R_L = 1kΩ and input voltage is 14V, calculate the power dissipated in the Zener diode.

This example was solved twice independently and both solutions agree.

Full-chapter free lectures picked from YouTube search results by views, from established JEE channels (mostly in Hinglish). Use the subtopic list to jump straight to the part you need (timestamps come from each video's own chapter list). Watch one, then solve PYQs the same day.

• SEMICONDUCTOR in One Shot: All Concepts & PYQs Covered |JEE Main & Advanced — JEE Wallah, 5:17:46
  Jump to a subtopic (20)

  • 00:00 Introduction
  • 03:45 Logic Gates
  • 1:14:21 Semiconductor
  • 1:53:06 Energy bonds
  • 1:59:24 n type
  • 2:12:18 p type
  • 2:20:46 pn Junction diode
  • 2:23:44 Resistivity and conductivity
  • 2:42:58 Questions
  • 2:43:02 pn Junction diode
  • 2:46:56 Mogambo
  • 2:51:57 Forward and Reverse Bias
  • 3:20:00 Junction bised
  • 3:26:42 Behavior of pn Junction with bias
  • 3:29:04 Conparision between forward and reverse bias
  • 3:31:30 Questions
  • 3:57:07 Rectifier
  • 4:10:00 Zener diode
  • 4:28:24 Reverse Breakdown
  • 5:17:40 Thank you Bachhon!
• SEMICONDUCTOR in 1 Shot - All Concepts Covered || JEE Main & Advanced || Class 12 — Lakshya JEE, 5:00:13

• 10 JEE Main 2026 PYQs on Semiconductors and Electronic Devices, with solutions.
• Read the chapter in NCERT textbooks (official, free), then solve its NCERT Exemplar (official, free) questions.
• Chapter-wise past questions: JEE Main and Advanced PYQs and question bank.
• Timed practice tests: NTA Abhyas practice tests (official, free) and our free mock tests.
• See it move: interactive simulation.