Video narration
Node par currents ko add karke zero kyun bolte hain, aur closed loop mein voltages ka sum zero kaise hota hai? Breadboard ke simple DC circuit mein, jahan wires aur resistors connected hain, ek junction ko node samjho. Aur source se nikal kar wapas source tak aane wala poora closed path, ek loop hai. Yahin dono laws alag hote hain. KCL, ya Kirchhoff’s Current Law, node par current ka balance batata hai. KVL, ya Kirchhoff’s Voltage Law, closed loop mein voltage ka balance batata hai. KCL charge conservation par based hai. Node par charge jama nahi hota. Isliye jitna current enter karta hai, utna hi leave karta hai. Entering current ko positive aur leaving current ko negative maan sakte ho; algebraic sum zero aayega. Maan lo breadboard ke ek node mein 5 A enter kar raha hai. Ek branch se 2 A bahar ja raha hai, aur doosri branch ka current I hai. Equation hogi: 5 - 2 - I = 0. Isliye I = 3 A. Current node par khatam nahi hua; split hua. Ab ek single closed loop lo: 12 V source, aur series mein 4 ohm aur 2 ohm resistors. Loop ko ek direction mein trace karte hue source ko voltage rise, aur resistors ko drops maan lo. KVL deta hai: 12 - 4I - 2I = 0. Ohm’s law lagao: 12 - 6I = 0, to I = 2 A. Ab 4 ohm resistor ka drop V = IR, yani 8 V. 2 ohm resistor ka drop 4 V. Check karo: 12 V ka rise minus 8 V minus 4 V, zero. Toh confusion ka seedha jawab hai: KCL node par current balance karta hai, aur KVL closed loop mein voltage rise aur drops ko balance karta hai. Dono formulas nahi, conservation ke rules hain. Breadboard ke node par charge jama nahi hota; closed loop mein energy ka net change zero hota hai.