In a scrapyard when the workers need to pick up a car there is a crane with a magnet on it. So when they see a car they turn the electric magnet on so it picks up the car and they turn off the electric magnet to drop the car.
increase the current on the electromagnet
It is simply called a scrap magnet. Ohio Magnetics and Walker both manufacturer scrap magnets.
First you go to the map and find the scrapyard. Also, a little hint is it is called the kids scrapyard.
the electromagnet makes the door close when a fire alarm goes off
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.
A core
it connets to the bottom of the machine
The scrapyard.
To make an electromagnet work, you need an electric current flowing through a coil of wire, which is not needed for a regular magnet.
There are 2 syllables in scrapyard:scrap/yard
Vinyl Scrapyard - 2008 was released on: USA: 12 June 2008 (DVD premiere)
The driveshaft carries the power but the whole unit does the work.