Deewar Ke Peeche Kya Hai? 🔌
Ye chapter ka sabse kaam ka lesson hai. Ye sirf exam ke liye nahi — ye jaan bachane ke liye hai.
Aapke ghar mein bijli teen taaron se aati hai, aur teeno ka rang aur kaam alag hota hai.
| Taar | Rang (India) | Kaam |
|---|---|---|
| Live | Laal ya bhoora | 220 V par current laata hai — yahi khatarnaak hai |
| Neutral | Kaala ya neela | 0 V — current ke wapas jaane ka raasta |
| Earth | Hara ya hara-peela | Suraksha — zameen se juda, aam haalat mein current nahi bahta |
📌 Do zaroori niyam:
1️⃣ Sab kuch PARALLEL mein juda hota hai — taaki har upkaran ko poora 220 V mile
aur har ek ka apna switch ho.
2️⃣ Switch aur fuse hamesha LIVE taar par lagte hain, neutral par nahi.
⚠️ Ye doosra niyam bahut zaroori hai! Agar switch neutral par lagaya jaaye, toh
switch band hone par bhi upkaran live taar se juda rahega — aur use chhoone par
current lag sakta hai, jabki switch off dikh raha hoga.
⚠️ Do Bade Khatre
🔥 1. SHORT CIRCUIT
Jab live aur neutral taar seedhe aapas mein
chhoo jaate hain (taar ka cover phat gaya, ya paani aa gaya).
Ab current ko upkaran se guzarne ki zaroorat hi nahi — use ek
bahut chhota raasta (short cut) mil gaya. Aur us raaste ki resistance lagbhag
zero hai.
Ohm's law: I = V/R. R lagbhag zero, toh I
bahut bahut zyada! Aur H = I²Rt ke hisaab se garmi
varg ke ratio (anupaat) mein badhti hai — taar
turant laal-garam ho kar aag pakad sakta hai.
🔌 2. OVERLOADING
Jab ek hi line par bahut saare upkaran ek saath chala diye jaayein.
Sab parallel mein hain, toh har naye upkaran ke saath kul resistance
ghatta hai aur kul current badhta jaata hai. Taar ki apni ek
seema hoti hai — usse zyada current gaya toh wo garam hone lagta hai.
⚠️ Sabse zyada khatra bhaari upkaran se hai — heater, geyser, iron, AC. Inhe ek
hi socket par ek saath mat chalao.
🛡️ Bachaav ke teen hathiyaar:
1️⃣ FUSE — patla taar jo zyada current par
pighal jaata hai. Hamesha live taar par,
series mein.
2️⃣ MCB — fuse ka aaj ka roop. Wo pighalta nahi, bas
gir jaata hai aur dobara uthaya ja sakta hai. Uske andar wahi
electromagnet hota hai jo aapne pichhle lesson mein padha!
3️⃣ EARTHING — hara taar jo upkaran ki
metal body ko zameen se jodta hai.
Maan lo aapke iron ke andar ka live taar ghis kar uski
metal body se chhoo gaya. Ab poori body 220 V par
"live" ho gayi.
Bina earthing ke: aap iron chhuo — current ke paas zameen tak jaane ka
ek hi raasta hai: aapka shareer. Aur wahi jaanleva hai.
Earthing ke saath: body pehle se ek mote hare taar se seedhe
zameen se judi hai. Us raaste ki resistance aapke shareer se
bahut bahut kam hai. Current
hamesha aasaan raasta chunta hai — toh wo poora zameen mein chala jaayega, aapme
nahi.
Aur bonus: itna zyada current bahne se fuse ya MCB bhi turant ud jaayega, aur
poori line kat jaayegi.
Isiliye har metal wale upkaran mein teen-pin plug hota hai — teesri (moti, lambi)
pin hi earth hai. Use kabhi kaat kar do-pin mein mat lagao!
🩺 Bijli Ki Suraksha — Yaad Rakhne Layak
⚡ Sirf 0.1 ampere current dil ko rok sakta hai — aur ghar ki line
15-30 A tak de sakti hai. Yani bijli ko halke mein lena bahut mehnga pad sakta
hai.
Kabhi mat karo:
❌ Geele haath ya nange pair se switch, plug ya koi bijli ka upkaran chhoona
❌ Fuse ki jagah mota copper taar daalna
❌ Teen-pin plug ki earth pin todkar do-pin socket mein lagana
❌ Ek socket par kai extension board jodna
❌ Kate hue ya jude hue taar ko tape lagakar chalate rehna
Hamesha karo:
✅ Kaam se pehle main switch band karo
✅ Metal wale upkaran mein earthing zaroor
✅ Sahi ampere ka fuse/MCB
✅ Taar garam lage ya jalne ki gandh aaye toh turant band karo
⚠️ Agar kisi ko current lag jaaye: use haath se mat pakdo —
warna aap bhi usi circuit ka hissa ban jaaoge. Pehle
main switch band karo. Wo na ho sake toh sookhi lakdi, plastic ya
rubber se use hatao. Phir turant doctor ke paas le jao.
Bharat mein har saal hazaron log bijli ke kaaran jaan ganwaate hain, aur
short circuit ghar mein aag lagne ka sabse bada kaaran hai.
Aur zyadatar maamlon ki wajah bahut saadharan hoti hai:
🔹 Purani, ghisi hui wiring jo saalon se nahi badli gayi
🔹 Earthing ka bilkul na hona (kai purane gharon aur gaon mein aaj bhi)
🔹 Fuse ki jagah taar daal dena
🔹 Ek socket par bahut saare bhaari upkaran
Isiliye bharat sarkaar ne National Electrical Code banaya hai, jisme har naye ghar
mein earthing aur MCB anivarya hai.
Aap ghar par abhi ye jaanch sakte ho: apne ghar ke fridge, cooler ya geyser ka
plug dekho — kya usme teen pin hain? Aur kya wo teen-pin socket mein hi laga hai?
Agar nahi, toh ye baat ghar mein zaroor batao. Ye ek lesson sach mein kisi ki
jaan bacha sakta hai.
🧠 Apne Aap Ko Test Karo
🏠 Simulator mein short circuit karo aur dekho fuse kab udta hai!
Open Ghar Ka Circuit Simulator →