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1. electromagnet [ɪˋlɛktrəˋmægnɪt] n. 電磁體
　Passing an electric current through a coil of wire makes the coil a temporary magnet called an electromagnet.
　
2. medium [ˋmidɪəm] n. 媒介 (pl.media；mediums) 
　A medium is a substance or material which is used for a particular purpose or in order to produce a particular effect. 
　
3. conductor [kənˋdʌktɚ] n. 導體
　Electric charge moves easily through substances called conductors.
　
4. semiconductor [͵sɛmɪkənˋdʌktɚ] n. 半導體
　Materials that conduct electric charge better than insulators but not as well as conductors are called semiconductors, the most commonly used of which is silicon.
　
5. insulator [ˋɪnsə͵letɚ] n. 絕緣體
　Materials known as insulators resist the movement of electric charge.
　
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