Beranda > Fisika, Fisika SMP > Apakah elektron yang keluar dari baterai kembali lagi ke baterai?

Apakah elektron yang keluar dari baterai kembali lagi ke baterai?

Begitu sebuah baterai mengirimkan elektron-elektron ke dalam sebuah alat listrik, elektron-elektron itu mengalir melalui alat dan selanjutnya kembali ke baterai lagi, betulkah demikian?

Tidak persisi demikian. Dalam baterai, elektron-elektron memang pindah dari satu atom ke atom lain seperti kutu loncat. Tapi, tidak demikian halnya ketika listrik mengalir melalui seutas kawat atau sebuah rangkaian listrik yang rumit. Elektron-elektron tidak masuk begitu saja dari ujung kawat yang satu, melompat dari atom satu ke yang berikutnya, kemudian keluar dari ujung yang lain.

Katakanlah tegangan baterai mendorong elektron-elektron melalui seutas kawat dari kiri ke kanan. Yang sesungguhnya terjadi adalah tiap elektron menolak tetangga (yang tentunya berupa elektron) di sebelah kanannya, karena mereka sama-sama bermuatan megatif dan muatan yang sama cenderung tolak-menolak. Pada gilirannya elektron tetangga tadi juga menolak atau  mendorong elektron tetangganya di sebelah hilir (baterai), dan begitu seterusnya.

Ketika gelombang dorong-mendorong tadi akhirnya sampai ke ujung kawat -yang jauh lebih cepat ketimbang elektron pertama melompat-lompat sendiri menempuh belantara atom -efeknya tepat sama seolah-olah elektron di ujung akhir kawat sama dengan elektron di ujung awal kawat. Lagi pula, siapa yang dapat membedakan elektron satu dari yang lain? Bahkan sesama elektron pun tidak tahu. :mrgreen:

Kategori:Fisika, Fisika SMP
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