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10 stvari koje trebate znati o energetici E-mail
Autor Diana Me?imorec   
Srijeda, 17 Kolovoz 2011 14:45

Sezona kiselih krastavaca odnosi se i na energetiku, pa u ove tople ljetne dane donosimo na izbor deset stvari koje bi svaki informirani gra?anin trebao znati o energetici. Ako ste energetski stru?njak, slobodno izbjegnite ovaj ?lanak.

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1. Struja nije elektri?na energija.

Dobili ste ra?un za struju? ?itali ste u novinama da struja poskupljuje? Ili da va susjed proizvodi struju iz solarnih panela? Rije? struja toliko se ?esto i uporno koristi u medijima da velika ve?ina ljudi ne zna da njihove perilice rublja ili televizore zapravo pogoni elektri?na energija, a ne struja. Elektri?na struja je pojam koji ozna?ava tok elektri?nog naboja, kojeg naj?e?e prenose elektroni. Struju pokre?e elektri?ni napon. Elektri?na struja moe biti istosmjerna ili izmjeni?na i mjeri se u amperima. Elektri?nu energiju pojednostavljeno moemo objasniti kao umnoak (efektivnih vrijednosti) jakosti struje i napona te vremena (energija=napon x struja x vrijeme). Elektri?na energija se izraava u kilovatsatima (kWh). Ipak, nemojte struju potpuno izbaciti iz rje?nika stresla ga je struja je jo uvijek to?an izraz.

2. Troimo kilovatsate, a ne kilovate.

Kada kupujemo neki ure?aj, npr. suilo za kosu, na njemu obi?no pie kolike je snage. Snaga se pojednostavljeno moe izra?unati kao umnoak jakosti struje i napona i izraava se u vatima (W) ili kilovatima (1kW = 1000W). Snagu od 1 vata proizvodi struja jakosti 1 ampera, ako je ostvarena uz pomo? napona od 1 volta. Veza izme?u snage i energije je vrlo jednostavna: energija = snaga x vrijeme. Ili konkretno, ako suilo za kosu ima snagu 1200W, odnosno 1.2 kW to zna?i da ?emo ako suimo kosu sat vremena potroiti 1.2 kilovatsata (kWh).

3. Elektri?nu energiju nemogu?e je spremiti.

Kako je nemogu?e pospremiti elektri?nu energiju? Pa imamo baterije! Ne ba. U baterijama se nalaze kemijske tvari koje se aktiviraju kad na njih priklju?imo troilo. Zna?i, radi se o kemijskoj energiji koja se pretvara u elektri?nu. Kad odspojimo troilo ili iskoristimo svu pohranjenu kemijsku energiju, elektri?ne energije nema. Cijela se energetika zapravo temelji na ovom svojstvu elektri?ne energije nemogu?nosti njezinog spremanja.

4. Proizvodnja i potronja elektri?ne energije moraju uvijek biti uravnoteeni.

U proloj smo to?ki utvrdili da je elektri?nu energiju nemogu?e spremiti. Zato, da bismo ju mogli koristiti, moramo ju stalno iznova proizvoditi. Proizvodnja elektri?ne energije u elektranama u svakom trenutku mora biti jednaka potronji elektri?ne energije koji troe svi korisnici priklju?eni na elektroenergetski sustav. Zna?i, kada upalite perilicu rublja ili pe?nicu, u istom trenutku neka od elektrana mora reagirati kako bi proizvela elektri?nu energiju koju ?ete potroiti tijekom pranja rublja ili pe?enja kola?a. Sre?om, postoje ljudi koji rade 24 sata dnevno kako bi osigurali nesmetanu opskrbu elektri?nom energijom i koji brinu da se elektrane pale, gase, podiu i smanjuju snagu ili da se elektri?na energija uveze iz inozemstva, a sve prema trenutnim potrebama potroa?a. Sve te aktivnosti nazivamo vo?enjem sustava, a glavni centar za vo?enje sustava za Hrvatsku nalazi se u Vukovarskoj ulici u Zagrebu.



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Odgovor kj:
3Petak, 19 Listopad 2012 09:56
E J
Kako je kolegica i navela, ne pohranjuje se izravno elektri?na energija, nego se pohrana vri u obliku kemijske (baterije), potencijalne (voda, zrak) i drugih oblika energije iz kojih se onda proizvodi elektri?ne po potrebi.

lp,
Edo
kj
2Petak, 19 Listopad 2012 09:33
mexicanino
zanimljivo kako tehnologija za pohranu elektri?ne energije "ne postoji", a pove?anje udjela obnovljivih izvora en. u proizvodnji elektri?ne en. ovisi o toj tehnologiji.

bravo za portal obnovljivi.com!
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1Petak, 19 Listopad 2012 04:22
joe
u Americi bi onog ko je ovo napisao prozvali "Smart Ass"

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