PhysicsSurya · Class 2-3
Girte paani se bijli kaise banti hai?
Pahadon mein nadi par bade-bade baandh (dam) kyun banaate hain?
Socho pehle… phir dekho jawab
Taaki nadi ka paani rok kar ooncha jama ho. Jab yeh paani neeche girta hai, toh ek badi chakki ghumata hai, aur usse bijli banti hai.
Baandh ek badi mazboot deewar hai jo nadi ko rokti hai. Peeche paani ooncha jama ho jaata hai. Upar rakhe paani mein taakat chhupi hoti hai — jaise mez par rakhi gend, jo girne ko taiyaar hai!
Chakki zor se kyun ghoomti hai? Kyunki paani oonchai se girte-girte tez ho jaata hai. Tez paani turbine (badi chakki) ke pankhon ko dhakka deta hai. Turbine ek machine ghumati hai jo bijli banati hai.
Acchi baat: baarish nadi ko phir se bhar deti hai. Isliye girte paani ki bijli khatam nahi hoti.
Ghar pe try karo
Kaagaz ki phirki lo. Bade ke saath sink ya baalti ke upar mug se paani daalo — ek baar phirki ke bilkul paas se, ek baar thoda oonchai se. Kab phirki tez ghoomi? Mummy-papa ko batao kyun.
Wow!
Nadi ki bijli ki shuruaat Suraj se hoti hai — Suraj paani ko bhaap bana ke upar le jaata hai, aur baarish pahad par girti hai!
Mummy-Papa ke liye
Aaj bachche ke saath mug se paani gira ke phirki chalaiye aur poochiye: 'Baandh paani ko ooncha kyun rokta hai?'
3 sawaal
- Baandh kya karta hai?
Jawab dekho
Nadi ka paani rok kar ooncha jama karta hai. Baandh nadi ko rok kar paani ooncha jama karta hai.
- Turbine kya hai?
Jawab dekho
Ek badi chakki jo paani se ghoomti hai. Turbine badi chakki hai jise girta paani ghumata hai.
- Chakki tez kyun ghoomti hai?
Jawab dekho
Paani oonchai se girkar tez ho jaata hai. Oonchai se girte-girte paani tez ho jaata hai aur zor ka dhakka deta hai.
NCERT se jodo: NCERT Class 3 EVS — paani aur hamare aas-paas