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Electricity Book Back Questions & Answers, Exercises, Solutions, Tests, Quizzes, Videos and Podcasts for Class 7 | Unit 2 | Physics | Science | Samacheer Kalvi – English Medium

7th Standard Samacheer Kalvi Physics New Book Back Questions & Answers: https://www.thelearning.app/samacheer-kalvi-english-medium/class-7/science-2/electricity-3/exercises

Podcasts: https://www.thelearning.app/samacheer-kalvi-english-medium/class-7/science-2/electricity-3/videos

Tests & Quizzes: https://www.thelearning.app/samacheer-kalvi-english-medium/class-7/science-2/electricity-3/tests

Flash Cards: https://www.thelearning.app/samacheer-kalvi-english-medium/class-7/science-2/electricity-3/flashcards

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00:00 Introduction
00:15 Choose the correct answer
02:05 Fill in the blanks
04:30 True or false
06:41 Match the following
08:32 Match the following

Questions answered in this video –

1. In the circuit diagram below, 10 units of electric charge move past point x every second What is the current in the circuit __________

2. In the circuit shown, which switches (L,M or N) must be closed to light up the bulb?

3. Small amounts of electrical current are measured in milliampere (mA). How many milliampere are there in 0.25 A ?

4. The direction of conventional current is —————— to electron flow.

5. One unit of coulomb is charge of approximately —————— protons or electrons.

6. —————— is used to measure the electric current.

7. In conducting materials electrons are —————— bounded with atoms.

8. S.I. unit of Electrical conductivity of a conductor is ——————–

9. Electron flow is in the same direction to conventional current flow.

10. The fuse wire does not melts whenever there is overload in the wiring.

11. In a parallel circuit, the electric components are divided into branches.

12. The representation of the electric current is A.

13. The electrical conductivity of the semiconductor is in between a conductor and an insulator.

14. Cell

15. Switch

16. Circuit

17. Miniature circuit Breaker

18. Fuse

19. Water : pipe :: Electric current :_____

20. Copper : conductor :: Wood : _____

21. Length : metre scale : : Current : _____

22. milli ampere: micro ampere : : 10^-3 A : _____

23. (A): Copper is used to make electric wires… (R): Copper has very low electrical resistance.

24. (A): Insulators do not allow the flow of current through themselves… (R): They have no free charge carriers.

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