Series & Parallel Circuits | O Level & IGCSE Physics 5054/0625

Series & Parallel Circuits | O Level Physics 5054 & IGCSE 0625 in Urdu: current, voltage and combined resistance explained 📲 Live classes & admissions — WhatsApp Sir Mahad Amer: https://wa.me/message/CKEDMPETUF4KA1 ▶ Next: Potential Dividers & LDR Circuits    • Potential Dividers & LDR Circuits | O Leve...   Electrical Quantities Lecture 7 by Sir Mahad Amer, building on Ohm's law from the earlier lectures. This lecture starts with open circuits and short circuits, reviews the electrical power, energy and efficiency equations, and then compares series and parallel circuits: how current, voltage and resistance behave in each, how to calculate the combined resistance of resistors in parallel, and the advantages and disadvantages of each arrangement, with numerical problems throughout. What you'll learn: • Open circuits and short circuits • Electrical power, energy and efficiency equations • Current, voltage and resistance in series circuits • Parallel circuits and combined (equivalent) resistance • Comparing series and parallel circuits ⏱️ Chapters: 0:00 Intro: recap & plan for electric circuits 2:15 Open & short circuits 3:00 Open circuit: switch open, no current 4:00 Short circuit: a zero-resistance path 6:00 Electrical power: P = VI 7:00 Formula summary: V = IR, P = VI 8:00 Efficiency in terms of power 8:30 Worked examples: power & resistance 10:15 Series vs parallel circuits 13:00 Series: the same current everywhere 16:00 Series: voltages add up to the e.m.f. 17:00 Series: total resistance = sum of resistances 📲 Live classes & admissions — WhatsApp Sir Mahad Amer: https://wa.me/message/CKEDMPETUF4KA1 19:00 Use total voltage with total resistance 21:00 Past paper (May/June 2023): series circuit 22:15 Series practice: identical lamps 25:00 Question: filament lamp & a new battery 27:45 Question: three resistors in series 30:00 Parallel circuits: advantages 31:00 Parallel: same voltage per branch, current divides 32:00 Parallel: 1/R = 1/R1 + 1/R2 + ... 34:00 Summary: series vs parallel 34:30 Question: resistors in parallel 37:00 Pros & cons of parallel circuits ▶ Full playlist:    • 4.3 Electric Circuits | O Level & IGCSE Ph...   📚 Related:    • 4.2 Electrical Quantities | O Level & IGCS...   Yeh lecture Urdu mein hai — series aur parallel circuits mein current, voltage aur combined resistance ka farq numericals ke saath samjhein. 📒 Free notes for this topic: https://sirmahadamer.com/notes/electr... 📝 Topical past papers: https://sirmahadamer.com/past-paper/u... 🎥 Recorded lecture page: https://sirmahadamer.com/recorded_lec... ━━━━━━━━━━━━━━ 🎓 Study with Sir Mahad Amer — Cambridge-certified Physics teacher (MSc Physics), founder of MAC Education Network (Physics with MAC). Live online classes + a complete recorded course for O Level Physics (5054) & IGCSE Physics (0625) — structured lessons, notes, topical past papers and doubt-clearing sessions. 7+ years • 1,000+ students • 90% A*/A 💬 Enrol, batch timings & fees (WhatsApp): https://wa.me/message/CKEDMPETUF4KA1 📘 Free notes & past papers: https://sirmahadamer.com/resources/ 🌐 Website: https://sirmahadamer.com 📸 Instagram:   / mahad__amer   👍 Facebook:   / mahadamer2000   #OLevelPhysics #IGCSEPhysics #ElectricCircuits #PhysicsInUrdu