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

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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?

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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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