The electricity magnetizes the electromagnet. Increasing current boosts the electromagnet's magnetic force, and decreasing current lowers the magnetism. When the current jumps to unsafe levels, the electromagnet is strong enough to pull down a metal lever connected to the switch linkage. The entire ...
In a strong magnetic field, some walls disappear entirely. The resulting magnet's strength depends on the amount of force used to move the domains. Its permanence, or retentivity, depends on how difficult it was to encourage the domains to align. Materials that are hard to magnetize generally...
You can magnetize them again by rubbing a magnet on it. Putting the 'Electro' in 'Electromagnet' Since you need an electrical current to operate an electromagnet, where does it come from? The quick answer is that anything that produces a current can power an electromagnet. From the small ...
Maxwell's work was responsible for many of the scientific principles at work, but he wasn't the first scientist to experiment with electricity and magnetism. Nearly 50 years earlier, Hans Christian Oersted found that a compass he was using reacted when a battery in his lab was switched on ...
Maxwell's work was responsible for many of the scientific principles at work, but he wasn't the first scientist to experiment with electricity and magnetism. Nearly 50 years earlier, Hans Christian Oersted found that a compass he was using reacted when a battery in his lab was switched on ...
They are battery powered and, because they use so little electricity, the battery can often last several years before you need to replace it. They are also much more accurate than pendulum clocks. Quartz watches work in a very different way to pendulum clocks and ordinary watches. They still...
The only trouble is, though many of our appliances are designed to work with AC, small-scale power generators often produce DC. That means if you want to run something like an AC-powered gadget from a DC car battery in a mobile home, you need a device that will convert DC to AC—an...
but I’d say between that size and a mid-sized screwdriver would work. If you don’t have a magnetic-head screwdriver, try to find a magnet big enough to magnetize the driver head. This helps the screws stick to the head, making it much easier to remove and replace the screws without...
How to Rewind an Alternator: This will cover rewinding of an alternator stator for use in a wind turbine generator. Traditionally, the use of car alternators is discouraged in favor of homemade slow running axial flux generators. However I bought a smal
The typical hard drive uses a circular flat piece of metal with an iron oxide or chromium dioxide coating to create and store information. Electrical pulses move through a coil in the head of the hard drive to magnetize part of the metal and position the coating to store information in binar...