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Electricity: Circuits and their Components — Revision Notes

CBSE · Class 7 · Science

Electricity: Circuits and their Components revision notes for CBSE Class 7 Science: 4 topics in quick points. Part of the CBSE Class 7 Science syllabus.

44 questions72 flashcards5 concepts

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Key Topics to Revise

1

1. Electric Cell and Battery

  • An electric cell is a portable source of electrical energy.
  • An electric cell has two terminals: positive and negative.
  • The positive terminal is the metal cap, which is protruding.
2

2. Electric Lamps: Incandescent Lamp and LED

  • An incandescent lamp has a thin wire called a filament inside a glass bulb.
  • The filament is attached to two thicker wires that form the two terminals of the lamp.
  • In an incandescent lamp, polarity does not matter for the lamp to glow.
3

3. Electrical Circuit and Switch

  • A lamp glows only when a complete electrical circuit is formed.
  • An electrical circuit is a complete path for electric current to flow through the lamp.
  • The direction of electric current in a circuit is taken from the positive terminal to the negative terminal of the cell.
4

4. Circuit Diagrams and Symbols

  • A circuit diagram is a representation of an electrical circuit using symbols.
  • Symbols make circuits easier to draw and understand.
  • In the symbol for an electric cell, the long line represents the positive terminal and the short line represents the negative terminal.

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Full Notes

Key Concepts

An electric cell is a portableA battery is a combinationAn incandescent lamp has a thinAn LED has no filamentA circuit is a complete path

Frequently Asked Questions

What are the important topics in Electricity: Circuits and their Components for CBSE Class 7 Science?
Key topics in Electricity: Circuits and their Components include Electric Cell and Battery, Electric Lamps: Incandescent Lamp and LED, Electrical Circuit and Switch, Circuit Diagrams and Symbols. Study these first, then practise questions on each for Class 7 exams.
How should I revise Electricity: Circuits and their Components for Class 7 exams?
Learn the core ideas first, then work through the 44 practice questions on Electricity: Circuits and their Components. Revise definitions regularly and use flashcards for quick recall 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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