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There is an electromagnet in that crane
many people uses an electromagnet when working.
Can be turned off
They both need electricity to work.
An electromagnet is powered by electrical current and that current can be adjusted to different levels of magnetism,Êso if you disable its electrical connection it will not work.
how to make road rail signal using electromagnet
There is an electromagnet in that crane
many people uses an electromagnet when working.
Can be turned off
Electromagnets are widely used now. Instead of traditional magnets.
the electromagnet makes the door close when a fire alarm goes off
That is an electromagnet.
A cell or other (DC) power source must, indeed, be connected to an electromagnet to make it work. It is an electromagnet. Surf the link to our friends at Wikipedia. It's a good article, and the pics are cool.
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A core
the armature
it connets to the bottom of the machine