In Michael Faraday's generator, coils of copper wire rotating between the poles of a magnet produce a steady current of electricity. One way to rotate the disk is to crank it by hand, but this isn't a practical way to make electricity. Another option is to attach the shaft of the gene...
Much of the world has long held a fearful image of the Shuar tribespeople. The idea of a person who, under the influence of hallucinogenic drugs, will drive a spear through your throat, cut your head from your body, and wear it, shrunken, is indeed fearsome. Beginning in 1599, the Sh...
which is run byElon Musk. The FCC has given SpaceX permission to launch 12,000 satellites designed to work in tandem to provide high-speed satellite internet access to users worldwide.SpaceXhas also filed paperwork with an international
How does the Hall effect work? When an electric current flows through a material, electrons (shown here as blue blobs) move through it in pretty much a straight line. Put the material in a magnetic field and the electrons inside it are in the field too. A force acts on them (the ...
In the redesign, the insulation has been removed and the fitting now mounts across the top of a copper plate, which contains electric heaters. The heater can warm the fitting and prevent ice buildup. Second, liquid nitrogen is used to purge the intertank connection of any potentially explosive...
Sectors in an Expanding Economy If there is a large increase in the purchase of raw materials, such ascopperor crude oil, it may be an indication that the economy is expanding. In other words, in an expanding economy, businesses and consumers tend to use more raw materials and energy since...
Let's look at each of these parts in more detail. The power supply is simply a source of electric current. Typically, the current used in medium- to large-caliber rail guns is in the millions of amps. The rails are lengths of conductive metal, such as copper. They can range from ...
In Michael Faraday's generator, coils of copper wire rotating between the poles of a magnet produce a steady current of electricity. One way to rotate the disk is to crank it by hand, but this isn't a practical way to make electricity. Another option is to attach the shaft of the gene...
In 1892, there was a series of famous strikes in the United States -- a general strike in New Orleans, a copper miners' strike in Idaho and a coal miners' strike in Tennessee -- but none became as famous as the Homestead Strike against Andrew Carnegie's steel empire in Pennsylvania [so...
The inside part is the rotor, which does move. The rotor here is like the nail in our previous example, and the stator is like the horseshoe magnet. When DC power is sent through the rotor, it creates a temporary electromagnetic field that interacts with the permanent magnetic field of ...