Magnetic lines of force, or flux, are measured in Webers (Wb). In electromagnetic systems, the flux relates to the current. A field's strength, or the density of the flux, is measured in tesla (T) or gauss (G). One tesla is equal to 10,000 gauss. You can also measure the field...
Two other magnets are used in MRI systems to a much lesser extent. Resistive magnets are structurally like superconducting magnets, but they lack the liquid helium. This difference means they require a huge amount of electricity, making it prohibitively expensive to operate above a 0.3 tesla level...
There is no sparking and much less electrical noise. There are no brushes to wear out. With the electromagnets on the stator, they are very easy to cool. You can have a lot of electromagnets on the stator for more precise control. The only disadvantage of a brushless motor is its higher...
And new evidence, from thespaceagency's Juno craft, points to surface processes that create bounties of oxygen on Europa, some of which is transported into the world's voluminous ocean. It's not as much oxygen as some research has previously suggested, but it's nothing to sneeze at: ...
The battle between these two very different visions of electric power is sometimes known as the War of the Currents. [1] Despite Edison's best (or worst) efforts, Tesla won the day and AC electricity now powers much of the world. That's largely why many of the electric motors that ...
Industrial plants have huge factory machines that are much bigger and more energy-hungry than anything you have at home. The energy an appliance uses is directly related (proportional) to the voltage it uses. So, instead of running on 110–250 volts, power-hungry machines might use 10,000–...
(A1-A3) contribute to spin and carrier relaxation. This is simply because the optical phonons are not excited at such lowT(correspondingkBT ~ 0.34 meV much lower than optical energy ≳ 2 meV). AtT ⩾ 10 K, optical modes are more important for both spin and carrier ...
One part of my laptop is now newer than the rest of it, which should mean I don’t have to spend quite as much time with two other parts of the computer. But should I feel that good about having to send a second computer from the same vendor back to the shop? I spent a long ...
Copper has the lowest resistivity of most common materials and this is why it is widely used in the manufacture of cables. Silver has a lower resistivity than copper, but it is much more expensive. Aluminium is generally used for overhead cables and although it has a higher resistivity than...
A qualitatively similar effect—ferrofluid droplet division in a non-uniform magnetic field (B = 68 mT) with gradient, dB/dz = 6.6 Tm−1—was recently reported in15. It is obvious that living cell mechanics is much more complex than that of a liquid droplet. ...