How do Fuel Cells Work?

Fuel Cell 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.…

Difference between microprocessors and microcontrollers

MicroprocessorMicrocontrollerA microprocessor requires multiple external support devices such as ROM, RAM, Serial interface, Timers, and I/O ports. These components are connected via a system bus, which includes an address bus,…

How does a car Air Conditioner work?

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:-

Compressor and mounting brackets
Condenser
Receiver/ drier
Expansion Valve
Evaporator
Hose & fittings

The easiest way to explain how the system works is to trace the refrigerant as it flows through the system:- (more…)

How does a speaker work?

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…)

How does a scanner work?

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…)

Optical Mouse

The Optical mouse was introduced by Agilent Technologies in 1999. In this technology uses a tiny camera that takes thousands of pictures per second to determine position and speed. A very small light emitting diode is used in the optical mouse. Commonly preferred LED is red LED. The light from the LED falls on the mouse pad or desk surface and bounces back onto a CMOS (Complimentary Metal Oxide Semiconductor).

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Fluorescent lamps

lighting001- ELECTRICAL CLASSROOM

Fluorescent lamps are commonly used every where. These lamps are more energy efficient than ordinary incandescent light bulbs. (more…)

How Does an incandescent Bulb Work?

081209 light bulb 03- ELECTRICAL CLASSROOM

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…)

Operation of generators

The generator is a device which converts the mechanical energy into electrical energy.

Construction

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.

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