If you've read How Electromagnets Work , then you know that an electromagnet is a coil of wire, usually wrapped around a piece of magnetic metal, such as iron.
(you; 've read; How Electromagnets Work) (a coil of wire; wrapped; around a piece of magnetic metal, such as iron; T:usually) (you; know; that an electromagnet is a coil of wire; T:then) Context(you know,List([46, 54))):(an electromagnet; is; a coil of wire, usually wrapped around a piece of magnetic metal, such as iron)
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you a coil of wire you an electromagnet
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How Electromagnets Work
around a piece of magnetic metal, such as iron T:usually
that an electromagnet is a coil of wire T:then
a coil of wire, usually wrapped around a piece of magnetic metal, such as iron