What is an electromagnet?

1 Tháng Tám, 2018

When an electric current flows through a wire, it sets up a magnetic field around the wire. The field is stronger if you wind the wire into a coil. Just add one more item, an iron rod (or nail), and you can make an electromagnet. An electromagnet is a magnet made when an electric current flows through a coil of wire wrapped around an iron rod. When current flows, the iron rod acts like a magnet. Its two ends become north and south poles.

How are electromagnets used?

Electromagnets are often more useful than permanent magnets because:

  • you can turn them on and off by switching the current on and off
  • you can make them stronger by increasing the current and/or the coils of wire.

Electromagnets are used in many things people use everyday, including:

  • doorbells

  • electric guitars.

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