Electric Power, Power Dissipation & Joule's Law - Unit # 15 Current Electricity - Class 10 Physics

In this detailed lecture, Sir Muhammad Talha thoroughly explains Electric Power, Power Dissipation, and Joule's Law for Class 10 Physics Unit 15: Current Electricity. Understand the exact physical meaning of electric power (the rate at which work is done or electrical energy is transferred), its mathematical derivation ($P = IV$), and practical wattage examples in everyday household appliances. The lecture dives into Power Dissipation in resistors ($P = I^2 R$) due to electron collisions with metal lattice atoms, and concludes with a complete derivation of Joule's Law of Heating ($H = I^2 R t$). This video strictly aligns with the latest curriculum for the Board of Secondary Education Karachi (BSEK Sindh Board), Federal Board (FBISE), Punjab Board, KPK Board, and matriculation physics preparation across Pakistan. 📌 Study Notes & Solved Board Past Papers: https://talhaphysicsacademy.blogspot.com ⏱️ Timestamps: 00:00 - Introduction: What actually gets consumed in electrical circuits? 00:46 - What is Electric Power? (Definition & Energy Transfer) 02:42 - Mathematical Derivation of Electric Power Formula (P = IV) 05:51 - Real-World Power Ratings of Household Appliances (LED, Heaters, Fridge) 08:39 - Concept of Power Dissipation in Resistors 12:08 - Derivation of Power Dissipation Formula (P = I²R) 13:38 - Joule's Law of Heating (Statement & Physical Explanation) 15:42 - Mathematical Derivation of Joule's Law (H = I²Rt)