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Bijli ke Conductor aur Insulator

Class 7 Science · Chapter 3: Bijli: Circuit aur Unke Hisse · NCERT Curiosity section 3.4

Seekho

Taar dhaatu ke aur plastic se dhake kyun hote hain? Ishaan ek tester banaata hai: cell aur bulb, do khule taar ke sire. Sire milaane par bulb jalta hai. Ab wo baari-baari har cheez se sire chhuaata hai.

Chaabi, chammach, sikka, aluminium foil ya sui se bulb jalta hai; plastic, rubber, lakdi, kaanch, kaagaz, mom ya cork se band rehta hai. Jo padaarth current aasaani se jaane dein ve conductor (achchhe chaalak); jo na jaane dein ve insulator (kharaab chaalak). Dhaatu conductor hain.

Chaandi, taamba aur sona sabse achchhe chaalak; taar zyaadatar taambe ke, jo sasta aur bahut hai. Plastic, rubber aur ceramic insulator hain, isliye taar, plug aur switch dhakte hain taaki hum surakshit rahein. Dono zaroori: conductor current le jaate, insulator use sahi jagah rakhte.

Saavdhaan: hamara shareer conductor hai. Isse current gambhir chot ya maut de sakta hai. Geele haath se switch ya plug mat chhuo, geeli jagah bijli ka saamaan mat chalaao, aur kharaab insulation wala saamaan kabhi use mat karo. Cell DC dete hain; socket AC, jo bade upkaran chalaata hai.

Explore: conduction tester.

  1. Har cheez jaanchkar sort karo.

Yaad rakho

  • Conductor (dhaatu) current jaane dete; insulator (plastic, rubber, lakdi, kaanch) nahi.
  • Suraksha ke liye insulator conductor ko dhakte; shareer chalaata hai, saavdhaan raho.

Quick check

Bijli ke taar taambe ke kyun?

  1. taamba achchha, sasta conductor
  2. taamba insulator
  3. taamba sabse halki dhaatu
  4. taamba kabhi garam nahi hota
Answer

taamba achchha, sasta conductor. Taamba bahut achchha chalaata hai aur chaandi-sone se sasta aur zyaada.

Socho

Ghar ki cheezein likho jo sirf conductor, sirf insulator, aur dono se bani hon.

Ek answer

Sirf conductor: steel chammach, chaabi, keel. Sirf insulator: plastic baalti, rubber chappal, lakdi ka chammach. Dono: press, plug, plastic hatthe wala pechkas, taar.

Practice

Teen levels (easy, medium, hard) ke naye sawaalon se practice karo, kuch hands-on, hints aur hal ke saath. Topic poora karne ke liye pichhle 5 mein se 4 sahi karo.