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Revision Notes

Basics of Communication

Telangana Board · Class 12 · Physics

Quick revision notes for Basics of Communication — Telangana Board Class 12 Physics. Key concepts, formulas, and definitions for last-minute revision.

44 questions22 flashcards5 concepts

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Key Topics to Revise

1

Components of Communication System

  • Essential elements: Transmitter, Communication channel/medium, Receiver
  • Transmitter converts information signal into electrical signal suitable for transmission
  • Communication channel carries the signal (wire, optical fiber, or free space)
2

Types of Signals

  • Analog signals: Continuous variations of voltage/current with time
  • Digital signals: Discrete stepwise values (binary: 0 and 1)
  • Analog signals are single-valued functions of time
3

Electromagnetic Spectrum and Wave Propagation

  • EM waves consist of oscillating electric and magnetic fields
  • E and B fields are perpendicular to each other and direction of propagation
  • Speed of EM waves in vacuum = 3×10⁸ m/s
4

Sampling Theorem

  • Sampling converts analog signal to discrete-time signal
  • Sampling theorem: fs ≥ 2fm (Nyquist criterion)
  • fs = sampling frequency, fm = maximum signal frequency

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Full Notes

Key Concepts

A communication system consists of threeAnalog signals are continuous functionsStates that an analog signalProcess where carrier wave amplitude variesCarrier frequency varies according to modulating

Frequently Asked Questions

What are the important topics in Basics of Communication for Telangana Board Class 12 Physics?
Basics of Communication covers several key topics that are frequently asked in Telangana Board Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Basics of Communication — Telangana Board Class 12 Physics?
Start by understanding all key concepts. Practise previous year questions from this chapter. Revise formulas and definitions regularly. Use flashcards for quick revision before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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