New General Studies: Book 3 J.5 Unit 2 - Ch.4: Closed Circuits 01 aluminium 鋁 02 battery 電池 03 bulb 燈泡 04 closed circuit 閉合電腦 05 copper 銅 06 copper plate 銅片 07 silver 銀 08 efficiency 效能 09 electric wire 電線 10 insulator 絕緣體 11 conductor 導電體 12 negative pole 負極 13 positive pole 正極 14 power leakage 漏電