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Pilleri Neden Zıt Yönlerde Yerleştirmemiz Gerekir? - HAKANSEYHAN
Pilin çıkıntılı tarafını (+) işaretiyle, düz tarafını ise (-) işaretiyle titizlikle eşleştiririz. Bunu yapmak elbet zor bir işlem değildir sadece neden aynı yönlere değil de zıt yönlere bakmak zorundadırlar?
Cevaba geçmeden ilkin hızlıca pilin aslen ne olduğuna değinelim. Pilde kimyasal enerji depolanır ve bu da elektriksel bir forma dönüştürülür.
Piller, bir yada daha oldukça elektrokimyasal hücre, akış hücreleri yada yakıt hücreleri benzer biçimde elektrokimyasal aygıtlardan oluşur. Harici bağlantılar yardımıyla elektronik cihazlara güç vermesi sağlanır.
Pillerin zamanı oldukça eskilere dayanır.
Bağdat pili
Fotoğrafta gördüğünüz Bağdat pili, malum en eski insan yapımı pil sanılsa da bu iddia spekülatiftir. MÖ 250-MS 640 yılları aralığında kullanıldığı tahmin edilen bu kil çömleğin içinde bakır bir silindir ve bu silindir içine sabitlenmiş bir demir çubuk bulunğu için antik çağlara ilişik bir “voltaik pil” sanıldı sadece bu iddialar düzmece bilim ürünü olarak ele alınıyor. 2003 senesinde ABD’nın Irak işgali sonrasında Irak Ulusal Müzesi yağmalanınca Bağdat pili kayıplara karıştı.
“Voltaik pil” demişken; pillerin çağıl anlamda gelişimi 1800 senesinde İtalyan fizikçi Alessandro Volta yardımıyla gerçekleşti.
Voltaik pil
Voltaik pil ile gerçekleşen bu devrim yardımıyla piller geniş bir alana yayıldı. Elektromotor gücün yada gerilimin birimine volt denilmesinin sebebi Volta’nın yapmış olduğu çalışmalardır. Volta’nın emek harcamaları ise Luigi Galvani’nin çalışmalarına dayanır.
Aslolan sorumuzun cevabına gelecek olursak;
Pille çalışan bir aleti ele alalım, bunun emek harcaması için 3V gerektiği için her biri 1.5V olan iki tane AA pile gerekseme vardır. Bu iki pilden 3V alabilmek için bunların seri olarak bağlanması gerekir şu sebeple akım bu sayede akabilir.
Peki nedir seri olarak bağlamak?
Peş peşe bağlamak diyebiliriz. Nasıl ki bir el fenerine arka arkaya pil yerleştiriyorsak, doğrusu + ve – uçlar birbirine değiyorsa yan yana yerleştirilen pillerin bu uçlarının birbirine olabildiğince yakın olması gerekir.
Bu görselde de gördüğünüz suretiyle eğer aynı uçlar aynı yere baksaydı fazladan kabloya gerekseme duyulurdu.
Bu da fazladan araç-gereç ve iş gücü olduğundan mantıken en tasarruflu ve ergonomik yöntem tercih edilir. Bir ürün tasarlarken her milimetrenin dikkate alınması gerekir, fazladan bir telin dahil edilmesi bile israf olarak görülür ve üretim maliyetine yük olur. Toplam hacim açısından en verimli tasarımdır.
Bundan dolayı iki değişik ucun temas etmesi için bu kontaklar kullanılır:
Aslen en mantıklı tasarım, görseldeki bu pil çeşididir sadece dünya genelinde ötekiler daha yaygın olduğundan pazarda söz sahibi olamamıştır.
Kaynaklar: Science ABC, Vikipedi, Vikipedi 2, Vikipedi 3
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