NOR Gate

Duration: 9 min

This video lesson is available to enrolled students.

Return to /learn/DSSSB-TGT-COMPUTER-SCIENCE-PAPER-2/digital-electronics/logic-gates-hardware/universal-gates-nand-nor/asset-nor-gate after enrolling

Inside: a video lesson and guided study material.

Module outline

  1. About Course: About the Course
  2. Programming, Data Structures, OOP & Java: C Fundamentals, Control Flow, Functions, Arrays & Pointers, Storage Classes, Structures & Enums, DMA, Macros, Scoping & File Handling, Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing, Java, OOPS with C++, Java Fundamentals, Array, String, IO & References, Language Design, Intro to Compilers, Visual Basics, Syntax Analysis: Bottom-Up, Object Oriented Technology
  3. Computer Networks, TCP/IP & Network Security: Introduction to CN, Data Communication, DLL: Flow Control, DLL: Access Control, DLL: Error Control, Data Link Layer - Ethernet, Net Layer: IPv4 & Proto, Net Layer: IP Addressing, Transport Layer Services, TL: Congestion & UDP, Application Layer, Hardware basics, Network Access Technologies, Network Security, Society, Law & Ethics, Cloud Computing, Mobile Computing, Net Layer:Routing Protocol, Cyber Safety and Security
  4. Teaching Methodology: Child Development, Concept of Pedagogy, Theories, Inclusive Education, Experiential Pedagogy, Assessment & Evaluation, Curriculum Framework & Reforms, National Education Policy (NEP) 2020, Psychology, Teaching-Learning Process, Personality Development, Teaching Methods & Strategies, Learning and Motivation, Learners & Learning Process, Factors Affecting Teaching, Methods of Teaching, Nature, Objectives & Characteristics of Teaching, Teaching-Learning Aids & ICT Integration, Classroom Management & Communication, Evaluation, Assessment & Measurement, Curriculum & School Environment, Inclusive Education & Special Needs, Professional Development & Ethics
  5. Digital Electronics / Boolean Logic: Digital Systems & Boolean Basics, Logic Gates & Hardware, Boolean Expression, Boolean Minimization, Combinational Circuit, Sequential Circuits, Number System, Number Representation, Analog-Digital Conversion
  6. Operating Systems & Linux: Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Threads & Process Creation, Deadlock, Memory Management, Virtual Memory, File Management, Disc Scheduling, Unix OS, Linux OS, Distributed Systems, Windows OS
  7. Data Base Management System: Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, Relational Algebra, SQL, File Organization & Indexing, Transaction Management, Concurrency Control, Database Security & Authorization, Database Recovery, Data Warehousing & Mining
  8. Internet & Web Technologies: Website, Browser & Services, Internet Fundamentals, Web Design & Development, Protocols & Services, Web Publishing & Hosting, Server Side & Security, HTML Basics, CSS, Emerging Technologies, JavaScript-Basics, .Net Programming, Electronic Data Interchange and E-Commerce, XML
  9. Computer Fundamentals, IT Basics & Architecture: Basics of COA, Cache Memory Organization, Input Output Organisation, Register Transfer and Microoperations, Control Unit Design, Programming the Basic Computer, Terms & Abbreviations, MS Office Applications, Instr Formats & Modes, Floating Point Rep
  10. Python Language: Introduction to Python, Tokens, Variables, Data Types, I/O, Operators & Expressions, Control Flow & Looping, Collections & Strings, Functions & Modules, File Handling & Data Analysis
  11. Software Engineering: Fundamentals of Software Engineering, Software Requirements and Quality Assurance, Software Design, Estimation and Metrics, Software Testing, Software Maintenance and Configuration Management, extras, Fundamentals of Systems and Information Systems
  12. Design & Analysis of Algorithms: Algorithm Analysis, Time Complexity Analysis, Sorting Algorithms, Greedy Algorithms, Dynamic Programming, Minimum Spanning Trees, Shortest Path Algos, Advanced Algorithms
  13. Mathematics - I, II, III, IV: Permutation and Combination, Logarithm, Linear Algebra, Algebra, Calculus, Trigonometry, Vectors, Set Theory, Functions, Relations, Propositional and Predicate Logic, Research Process Steps, Graph Theory
  14. Computer Graphics, Multimedia & Mobile Computing: Basics of Computer Graphics, 2-D Geometrical Transforms and Viewing, 3-D Object Representation, Geometric Transformations and Viewing, Multimedia
  15. Emerging Trends: Emerging Tech Trends, Knowledge Representation, Natural Language Processing
  16. Statistical Techniques: Probability, Statistics
  17. Interpolation - DI: Data Interpretation
  18. Basis of Physics: Physics
  19. Previous Year Paper:
  20. Business Studies and Management: Business Communication, Business Organization and Management, Financial Accounting, Business Economics, Management Information System (MIS), Knowledge Management & New Economy
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

The lecture introduces the NOR gate as a fundamental logic element, defining its behavior and symbolic representation. The instructor explains that the output is high only when all inputs are low, equivalent to an OR gate followed by an inverter. The NOR gate is identified as a universal gate capable of implementing any other logic function, a property deferred to the next chapter. A truth table is constructed showing outputs 1, 0, 0, and 0 for input combinations 00, 01, 10, and 11 respectively. The session then transitions to Boolean algebra rules specific to NOR operations, deriving identities such as (a+a)' = a' and (a+0)' = a'. Finally, the lecture examines algebraic laws including idempotent and associative properties, demonstrating through handwritten annotations that certain NOR expressions are not equivalent, marked with crossed-out equals signs.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The instructor writes the heading 'Nor gate' and defines its operation: 'The output will be high if and only if all inputs are low.' A NOR symbol is drawn with inputs A, B and output Y=A+B. The slide notes the gate is 'a OR gate followed by an inverter' and calls it a 'universal gate.' A truth table is initiated with columns for Input (A, B) and Output Y = (A + B)', listing rows 0/0 through 1/1.

  2. 2:00 – 5:00 02:00-05:00

    The truth table is completed with handwritten outputs of 1, 0, 0, and 0 corresponding to input pairs 0/0, 0/1, 1/0, and 1/1. The slide reiterates that the NOR gate is a 'universal gate because it can be used to implement any other logic gate,' noting this will be covered in the next chapter. The instructor then introduces four numbered NOR-gate rules on a whiteboard, beginning with the equation (a + a)' and filling in the result as 'Comp' or complement, writing (a + a)' = a̅.

  3. 5:00 – 8:49 05:00-08:49

    The instructor continues deriving NOR identities, writing (a + 0)' = a̅ and marking the third rule's output as 0 for (a + a')'. The final segment shifts to a slide titled 'Idempotent and associative law,' displaying expressions like (a + a)′ and ((a + b)′+ c)′. Handwritten red annotations break terms into (a+b)+c and a+(b+c), while crossed-out equals signs (≠) are drawn to indicate non-equivalence between certain NOR groupings.

The lecture progresses from basic definition to algebraic manipulation. It begins by establishing the NOR gate's truth table and universal property, then moves to specific Boolean identities for NOR operations. The final section applies these identities to test algebraic laws, using visual annotations to distinguish equivalent from non-equivalent expressions. Key takeaways include the NOR truth table pattern (only 00 yields 1), the complement identities, and the non-associative nature of certain NOR groupings.

Loading lesson…