Class 8 General Science MCQs Part 13| Electricity, Current, Voltage, Resistance & Safety Devices
Автор: knowledge pills
Загружено: 2025-07-03
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Class 8 General Science MCQs Part 13| Electricity, Current, Voltage, Resistance & Safety Devices
In this detailed and engaging video, we explore Class 8 General Science (Part 13) based on the latest curriculum, focusing on the concept of electricity, electric current, voltage, resistance, power, fuses, circuit breakers, and safety wiring systems. Perfect for ETEA, PST, CT, PET, DM, and other competitive exam preparation, this video covers all key questions with answers and explanations in simple Urdu and English.
📚 Topics Covered in This Video (30+ Concepts):
1. Why do appliances like washing machines need electricity?
2. Effect of power interruption on electrical devices
3. Definition and SI unit of electric current
4. Symbolic representation of current (I)
5. Relationship between Ampere and Coulombs/second
6. Measuring small currents – milliampere and microampere
7. What causes current to flow in a wire? (Voltage)
8. Voltage and its symbol (V)
9. Effect of increased voltage on current (Direct relation)
10. Analogy of voltage and current using water tank system
11. Difference in pressure and water flow analogy
12. Voltage as electric potential difference
13. Definition and unit of voltage (Volt = 1 Joule/Coulomb)
14. Voltage and current in a lightning flash
15. Electric resistance – definition and behavior
16. Ohm’s Law and relationship between resistance and current
17. Formula for resistance (R = V/I)
18. Conductors vs Insulators – Copper, Aluminum vs Rubber
19. SI unit of resistance – Ohm (Ω)
20. Factors affecting resistance of a wire
21. Resistors – function and material
22. What is electric power and how is it calculated (P = IV)
23. SI unit of power – Watt
24. Example: Power consumed by a 5V, 1.6A battery
25. Power ratings of common devices (Hair Dryer = 2000W, LED = 12W)
26. Why are fuses used in circuits?
27. Fuse mechanism – Low melting point material
28. Advantages of circuit breakers over fuses
29. Working of circuit breakers – automatic disconnection
30. Purpose of Earth wire – zero potential, safety from shock
31. Earthing in 3-pin plugs – Earth pin connection
32. Safety mechanism during fault currents – fuse breaks the circuit
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✅ Each concept is explained clearly with real-life examples and Urdu translations to help students understand better and retain more.
📌 Recommended For:
8th Class Students
ETEA Science Prep
PST, CT, PET, DM Test Aspirants
General Science Revision
General Science Class 8 Part 13, Electricity class 8 Urdu, Electric current, Voltage, Resistance, Ohm’s Law, Circuit breaker, Fuse, Power formula, ETEA science preparation, PST science questions, CT PET DM syllabus, power rating of appliances, Earth wire function, Three-pin plug, Current and voltage relationship, Science test MCQs
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