An electromagnet is a magnet that consists of a piece of iron or steel surrounded by a coil. The metal becomes magnetic when an electric current is passed through the coil.
英汉词典释义
n.
<物>电磁体;电磁铁
To make an electromagnet you need to send a current through the wire.为了做成电磁体你需要对金属线送电。
英英词典释义
Noun
1. a temporary magnet made by coiling wire around an iron core; when current flows in the coil the iron becomes a magnet