Month: December 2012

How does a speaker work?

Speaker Diagram 1- ELECTRICAL CLASSROOM

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.

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How does a scanner work?

scanner- ELECTRICAL CLASSROOM

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.

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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.

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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.

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Operation of generators

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

Construction

GeneratorIn 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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