حل تريكات الـ Resistivity والـ Power و Ohm's Law | مسائل المقاومة الكهربية

في الفيديو ده هنشرح ونحل بالتفصيل أهم تريكات Electric Resistance و Ohm’s Law وقوانين Electric Power & Energy بأسلوب مبسط وسهل، علشان تفك أي مسألة معقدة وتقفل أسئلة الـ Ratio والجرافات بسهولة! 📌 ماذا ستتعلم في هذا الفيديو (Learning Outcomes): فهم العلاقات الرياضية والفيزيائية في قانون أوم (Ohm’s Law: V = IR) ومين بيعتمد على مين. حساب وفك مسائل المقاومة النوعية والتوصيلية الكهربية (Resistivity ρ & Conductivity σ). التفرقة بدقة بين قوانين الـ Consumed Power والـ Energy Lost وطرق حساب الـ Heat Dissipation. إتقان حل مسائل الـ Ratio وحالات إعادة التشكيل (Reshaping / Stretching / Drawing of wires) وثبات الـ Volume. قراءة وتحديد الـ Slope من جرافات الجهد والتيار (I-V and V-I graphs) وكيفية التعامل مع الـ Measurement Errors. تحليل اتجاه التيار الفعلي والاصطلاحي وحركة الـ Electrons والـ Protons في أجهزة التفريغ الكهربي. ⏱️ فصول الفيديو (Video Chapters & Solved Problems): 00:00 مقدمة وأسئلة الطلاب في Ohm's Law & Resistance 12:17 State the physical quantity of Ampere / (Volt . meter) 14:11 Direction of current through resistor vs battery 25:31 Work done to move 5 C charge between two points 26:18 Two wires with same V & material: find length and area ratio 33:20 Wire cut in half: find the new I-V graph slope 42:15 Rating of electric lamp: Potential difference and Power 46:53 Ranking rate of energy conversion (Power) changes 49:19 Comparing consumed power in circuits with V and R 50:16 Circuit with Voltmeter and Ammeter reading Power 52:16 Heat energy generated in copper wire in 5 minutes 01:11:37 Equivalent unit of electric power 01:16:41 Solid cube reshaped into wire: find length 01:19:27 Wire length and resistance: find mass of wire 01:21:25 Cylindrical rod drawn uniformly: find new resistance 01:25:25 Table comparing wire length, area, resistivity to find R 01:30:06 Lightning strike: calculate average electromotive force (EMF) 01:34:10 Two resistors with same current and charge: ratio of work done 01:36:54 I-V graph for two wires: ratio of their radii 01:43:08 I-V graph of two copper pieces: ratio of their lengths 01:46:52 Two circuits with different V and dimensions: current ratio 01:50:23 3m wire connected to 6V battery: potential difference across 50 cm 01:57:15 Resistance calculation with measurement error (Absolute & Relative Error) 02:04:24 Lamp rating: percentage change in power when voltage changes 02:09:51 Two lamps connected to mains: ratio of filament radii 02:13:21 Charge of 10 C in 5 s: current and electron direction 02:15:22 Iron and copper wires with same potential and current: ratio of radii 02:27:50 Square conductors X and Y: find resistance of Y 02:30:19 Resistance ranking of conductor branches 02:31:18 Wire cut and resized: calculate resistance of second wire 02:34:20 Circuit with variable wire: wire for minimum ammeter reading 02:36:20 Charge-time graph: determine current-time graph 02:39:48 Hydrogen discharge tube: total current from electrons and protons 02:50:00 Power vs Current graph: relation and physical slope #Physics #ElectricResistance #OhmsLaw #ElectricCurrent #ElectricPower #Resistivity #PhysicsProblems #ثانوية_عامة #فيزياء