PhysicsBhanu · Class 4-5
Paani ki oonchai se bijli tak: hydropower
Ek balti paani zameen par rakhi hai aur ek chhat par. Kis paani mein zyada 'kaam karne ki taakat' hai?
Socho pehle… phir dekho jawab
Chhat wale mein! Jo cheez oonchai par hoti hai, usmein stored energy hoti hai. Girte hue yeh energy speed ban jaati hai — aur speed se chakki ghoom sakti hai.
Energy ek roop se doosre roop mein badalti hai. Oonchai par rakhe paani mein stored energy hai (potential energy). Girte waqt paani tez chalta hai — yeh chalne ki energy hai (kinetic energy). Hydropower plant mein yahi hota hai: oonchai → tez paani → ghoomti turbine → generator → bijli.
Cause-effect: jitni zyada oonchai, utna tez paani; jitna zyada paani, utna bada dhakka. Isliye baandh ooncha banate hain aur badi nadiyon par lagate hain. Baandh paani jama bhi karta hai, taaki zaroorat ke hisaab se chhoda ja sake.
Baarish nadi ko phir bhar deti hai, isliye yeh 'renewable' energy hai — koyle ki tarah khatam nahi hoti, aur bijli banate waqt dhuaan bhi nahi nikalta.
Ghar pe try karo
Paani ka pahiya banao: paper plate ke kinaare par 6-8 chhote kaagaz ke cup tape se chipkao, beech mein chhed bade se karwa ke pencil daalo. Sink mein pencil pakdo aur bade ke saath mug se paani daalo — pehle 10 cm upar se, phir 30 cm upar se. Kab tez ghooma?
Wow!
Arunachal Pradesh mein ek baandh 237 metre ooncha banane ka plan hai — 70 se zyada manzil wali building jitna!
Mummy-Papa ke liye
Aaj bachche ke saath paper-plate ka paani-pahiya banaiye aur do oonchaiyon se paani daal kar farak dekhiye.
3 sawaal
- Oonchai par rakhe paani mein kaunsi energy hoti hai?
Jawab dekho
Stored (potential) energy. Oonchai par rakhi cheez mein stored (potential) energy hoti hai.
- Hydropower plant mein energy ka sahi kram kaunsa hai?
Jawab dekho
Oonchai → tez paani → turbine → bijli. Oonchai ki energy tez paani banti hai, paani turbine ghumata hai, generator bijli banata hai.
- Hydropower renewable kyun hai?
Jawab dekho
Baarish nadi ko phir bhar deti hai. Baarish se nadi phir bharti hai, isliye yeh energy khatam nahi hoti.
NCERT se jodo: NCERT Class 5 EVS (Looking Around) — paani ke srot aur uska upyog