Class 8 General Science MCQs Part 13| Electricity, Current, Voltage, Resistance & Safety Devices

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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