Fuel cells cleanly and efficiently convert chemical energy from hydrogen-rich fuels into electrical power and usable high-quality heat in an electrochemical process that is virtually absent of pollutants. (more…)
Microprocessor It has many support devices like ROM, Read-Write memory, Serial interface, Timer, I/O ports etc. All these support devices are interfaced to microprocessor via a system bus. All…
Air conditioning works continuously and has refrigerant continually circulating around a sealed system. Most automotive A/C systems are made up of six main components:-
The easiest way to explain how the system works is to trace the refrigerant as it flows through the system:- (more…)
Speaker is a device which converts electrical signal into sound waves. By
its property, sound is made when an object makes the particles around it
vibrate. These vibrations travel through the air, and reach our ears. Our brain
interprets this motion as sound. The amplitude of the waves corresponds to the volume level we hear and the frequency decides the nature of sound. (more…)
Scanners are used to create a soft copy of available photos and documents.
When we open the scanner we can see a glass plate. We have to place the
document that we need to scan over the glass plate. (more…)
Fluorescent lamps are commonly used every where. These lamps are more energy efficient than ordinary incandescent light bulbs. (more…)
In an incandescent light bulb, light is produced by the heating of filament. It has a carbon-based filament in the center of the bulb connected to the two terminals and maintained at vacuum glass chamber. This filament has a high resistance to electric current. (more…)
In order to understand the operation of a simple generator, consider rectangular coil ABCD placed in a magnetic field as shown in the figure. The two ends of the coil are connected to the two copper half rings (or split rings) R1 and R2 called commutator. There are two carbon brushes B1 and B2 which press lightly against the two half rings.