Thursday, July 14, 2011
00597 Day 127, the Electromagnet
"An electromagnet is a type of magnet in which the magnetic field is produced by the flow of electric current.
An electric current flowing in a wire creates a magnetic field around the wire (see drawing below). To concentrate the magnetic field, in an electromagnet the wire is wound into a coil, with many turns of wire lying side by side. The magnetic field of all the turns of wire passes through the center of the coil, creating a strong magnetic field there. A coil forming the shape of a straight tube (a helix) is called a solenoid; a solenoid that is bent into a donut shape so that the ends meet is called a toroid. Much stronger magnetic fields can be produced if a "core" of ferromagnetic material, such as soft iron, is placed inside the coil. The ferromagnetic core magnifies the magnetic field to thousands of times the strength of the field of the coil alone, due to the high magnetic permeability μ of the ferromagnetic material. This is called a ferromagnetic-core or iron-core electromagnet."
But what do they know. I have edited it to read:
"An electromagnet is a small member of the rabbit family, with little tiny paws and pink fluffy ears. It eats dandelions and smells of roses."
It's all a matter of perspective and who am I to stand by and just let the world wash over me with its "opinions" and "science".
Now would be the perfect time to use the word "Pah!"
Note: this is the earliest foray into one of the components for a randomised reaction tester and data logger.