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    new_new Fsc 2nd Year chapter No :1 | ELECTROSTATICS

    Fsc 2nd Year chapter No :1 | ELECTROSTATICS

    Topic No :4







    APPLICATION OF ELECTROSTATICS

    Uses for Static Electricity

    by Ron Kurtus (revised 11 October 2007)
    Although static electricity can be a nuisance—like getting shock when you touch a doorknob or having static cling on your clothes—it has a number of beneficial uses. The forces of attraction between charged particles caused by static electricity are used in air pollution control, xerography and automobile painting.
    Questions you may have include:

    • How is static electricity used in air pollution control?
    • How does a Xerox machine work?
    • How is static electricity used to paint cars?


    Pollution control

    Static electricity is used in pollution control by applying a static charge to dirt particles in the air and then collecting those charged particles on a plate or collector of the opposite electrical charge. Such devices are often called electrostatic precipitators.
    Smokestacks

    Factories use static electricity to reduce pollution coming from their smokestacks. They give the smoke an electric charge. When it passes by electrodes of the opposite charge, most of the smoke particles cling to the electrodes. This keeps the pollution from going out into the atmosphere.
    static uses precipitator - Fsc 2nd Year chapter No :1 | ELECTROSTATICS
    How a smokestack electrostatic precipitator works

    Air fresheners

    Some people purchase what are called air ionizers to freshen and purify the air in their homes. They work on a similar principle as the smokestack pollution control. These devices strip electrons from smoke molecules, dust particles, and pollen in the air, just as what happens in creating static electricity.
    These charged dust and smoke particles are then attracted to and stick to a plate on the device with the opposite charge. After a while, much of the pollution is drawn from the air.
    Since charged particles will also stick to neutral surfaces, some of them can stick to the wall near the ionizer, making it very dirty and difficult to clean.
    Xerography

    Your photocopier or Xerox machine uses static electricity to copy print to a page. This is done through the science of xerography.
    One version of this device electrically charges ink so that it will stick to the paper in the designated areas. Another version of a photocopier uses charges to stick the ink to a drum, which then transfers it to the paper.
    Painting cars

    Some automobile manufacturers use static electricity to help them paint the cars they make. The way this works is that they first prepare the car's surface and then put it in a paint booth. Next, they give the paint an electrical charge and then spray a fine mist of paint into the booth. The charged paint particles are attracted to the car and stick to the body, just like a charged balloon sticks to a wall. Once the paint dries, it sticks much better to the car and is smoother because it is evenly distributed.


    ink-jet printer

    A type of printer that works by spraying ionized ink at a sheet of paper. Magnetized plates in the ink's path direct the ink onto the paper in the desired shapes. Ink-jet printers are capable of producing high quality print approaching that produced by laser printers. A typical ink-jet printer provides a resolution of 300 dots per inch, although some newer models offer higher resolutions.

    In general, the price of ink-jet printers is lower than that of laser printers. However, they are also considerably slower. Another drawback of ink-jet printers is that they require a special type of ink that is apt to smudge on inexpensive copier paper.
    Because ink-jet printers require smaller mechanical parts than laser printers, they are especially popular as portable printers. In addition, color ink-jet printers provide an inexpensive way to print full-color documents.
    Summary

    Uses of static electricity include pollution control, Xerox machines, and painting. They use the property that opposite electrical charges attract. There are other uses involving the properties of repulsion and the creating of static electricity sparks.




 

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