When you feed in DC, the electromagnet works like a conventional permanent magnet and produces a magnetic field that's always pointing in the same direction. The commutator reverses the coil current every time the coil flips over, just like in a simple DC motor, so the coil always spins in...
Explain what is a pseudo force? Include an example. a. Describe what is meant by an inversion layer of charge. b. Describe how an inversion layer of charge can be formed in a MOS capacitor with a p-type substrate. State two ways by which the strength of an electromagnet can be increas...
Two pairs of electromagnet coils, shown here in red and blue, are energized in turn by an AC supply (not shown, but coming in to the leads on the right). The two red coils are wired in series and energized together and the two blue coils are wired the same way. Since it's AC, ...
Switch is an electrical component which can make or break electrical circuit automatically or manually. Switch is mainly works with ON (open) and OFF (closed) mechanism. Numerous circuits holdswitches that controlhow the circuit works or actuate different characteristics of the circuit. The classifica...
Animation: How a loudspeaker works. When a fluctuating electric current flows through the coil (orange), it becomes a temporary electromagnet, attracted and repelled by the permanent magnet (blue/red). As the coil moves, it moves the cone (gray) back and forth, pumping sound waves into the...
Unlike in the motorcycle brake, there is no contact at all between the electromagnet and the brake disc: there's an air gap of a few millimeters between them. Photo by Take-y courtesy of Wikimedia Commons published under a Creative Commons Licence. How do these things work in practice?
The electromagnet detected the pattern of magnetism on the tape and an electronic circuit changed this back into the sounds that fizzed and popped in your headphones.Photo: Great music, rotten CD! CDs were billed as virtually indestructible, but some early ones have fallen victim to a problem ...
This photo shows very nicely how a record player works. Turn on the machine and an electric motor (not shown) makes the black vinyl disc rotate around the silver peg in the center. You lower the tonearm (a pivoted lever with the stylus and cartridge on the end) onto the outer edge of...
Coil: This becomes an electromagnet whenelectricityflows through it. Transparent plastic cone: This makes the sound when it moves. Sponsored links How bigger headphones work As you might expect there's nothing radically different inside bigger headphones: they're just a scaled-up version of what ...
Right: If you took off the casing, this is the kind of thing you'd see. It's a simple brushless motor from a PC cooling fan, but it works in broadly the same way as a bike's hub motor. There's a static part made up of four electromagnet coils (left) and a rotating part (...