Video narration
Agar ek circuit mein voltage kahin ghatta hai, to poora chakkar lagane ke baad santulan kaise lautta hai? Roller-coaster mein car lift par upar jaati hai, hills par neeche aati hai, aur lap poora karke usi oonchai par lautti hai. Closed loop ko aise hi samajhiye: voltage, charge ki energy per unit hai. Ek charge ko clockwise chalaaiye. Battery use lift ki tarah +12V deti hai; do resistors hills ki tarah -7V aur -5V giraate hain. Yahin Kirchhoff's Voltage Law, yaani KVL, kehta hai: closed loop mein voltage rise aur voltage drop ka algebraic sum zero hota hai. Traversal direction aap khud chunte hain; bas poore chakkar mein signs lagataar ek jaise rakhein. Equation hai: +12V - 7V - 5V = 0. Voltage istemaal hokar khatm nahin hota; resistor energy ko heat ya motion mein transfer karta hai. To shuruaati sawaal ka jawaab hai: charge starting point par wahi energy lekar lautta hai. Isliye roller-coaster ki tarah, har rise aur drop milkar net change zero banaate hain.