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Uses of Static Electricity

Updated on May 28, 2010

We've all have experienced static electricity in one way or another. Those unexpected little shocks we get when we touch a doorknob or some other metalic object, the balloons that stick to the wall after being rubbed in the head, or hair itself standing straight when it comes close, all are produced by static electricity.

All those are common in our everyday lives, and at most they are fun to watch but, is there any practical uses of static electricity? or is it just a fun but useless electronic phenomenon?

The effects of static electricity in hair
The effects of static electricity in hair

What is Static Electricity?

Static electricity is generated when any material gains or loses electrons and becomes positively (when it loses electrons) or negatively charged (when it gains electrons). The acumulated charges are what's called static electricity.

It is called static because the charges do not move from where they where generated, unlike the electricity used to power electronic devices that flows from one pole of a battery or power source to the other. Most of the time it is produced when two objects come in contact or are rubbed together.

For a static charge to remain in an object, it must have a high resistance to the flow of electricity. That is why plastic balloons and hair remain charged, they are poor electric conductors. Other materials like aluminum can get a static charge, but it will dissipate very quickly because of its low resistance to the flow of electrons.

Images: Uses of Static Charges

Click thumbnail to view full-size
Static charges are used to remove dust and other pollutants in smokestacksSome copy machines use static electricity to produce the photocopiesElectrostatic charged paint is applied to cars for a quality finish
Static charges are used to remove dust and other pollutants in smokestacks
Static charges are used to remove dust and other pollutants in smokestacks
Some copy machines use static electricity to produce the photocopies
Some copy machines use static electricity to produce the photocopies
Electrostatic charged paint is applied to cars for a quality finish
Electrostatic charged paint is applied to cars for a quality finish

Practical Uses of Static Charges

The ability of opposite charges in static electricity is what's used when designing applications for it.

  • Dust removal: There are some appliances that can eliminate dust from the air, like air purifiers. They use static electricity to alter the charges in the dust particles so that they stick to a plate or filter of the purifier that has an opposite charge as that of the dust (opposite charges attract each other).

    This effect is also used in industrial smokestacks to reduce the pollution that they generate, altough they work in a very large scale, the effect is basically the same as the home air purifier.

  • Photocopy: Copy machines use static to make ink get attracted to the areas where we need the information copied. It uses the charges to apply the ink only in the areas where the paper to be copied is darker (usually this means text or other information) and not where the paper is white, this process is called xerography.

  • Car painting: To make sure a car's paint is uniform and that it will resist the high speeds and weather to protect the car's metal interior, it is applied with a static charge. The metal body of the car is submerged in a substance that charges it positively, and the paint is charged negatively with the paint sprayer.

    This process ensures a uniform layer of paint, since when there is enough negative paint in the car the extra will be repelled by the paint already in the car.

    It also ensures that the paint won't fall off, since the electrical attraction between the paint and the car is stronger than if it was just sprayed.

All of these processes use electronic circuits to generate and control the static charges generated. If you are interested in electricity and electronics, check out my electronic circuits for beginners site, where you will find simple circuits to get you started, When you have learned enough you can build your own practical static electricity circuits for your own use!

Even though lightning has a lot of energy, it can't be efficiently used or stored
Even though lightning has a lot of energy, it can't be efficiently used or stored

Power from Static Electricity?

Many people have wondered if static electricity can be used as a source of power for homes and industries. Despite the extremely high voltages that can be generated with static electricity (tens of thousands of volts, compared that to the 110v of a common power outlet) the amount current it can generate is very low, from microAmperes to a few miliAmperes (Ampere is the unit of electric current) and only for very short times.

Lightning can produce a considerable amount of energy, but the high voltages, current, temperature and speed of the discharge make it extremely difficult and inefficient to use or store.

Storing electricity is so inefficient that power plants will just sell the extra energy at a lower price or let it unused and lost instead of storing it because of the cost and also the amount of energy that can be stored is not significant enough to offset the expenses.

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      hi 2 months ago

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      Tyler Nolton 3 months ago

      Really helped me thank you much! :)

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      Lol 3 months ago

      Interesting

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      Starley 9 months ago

      very informative guys:)

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      kakin 16 months ago

      Love the Grammaer mistake guys :D

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      FK U 18 months ago

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      I need to know what makes static on a radio??????

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      THIS WAS GREAT:D

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      Don't help

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      wow static electricity is quite useful

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      :) 4 years ago

      who uses static and current electricity on a daily basis (as a job)

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      diaa 4 years ago

      is the static electricity same as electrostatic????

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      alia 4 years ago

      put some more information about static electricity and there application

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      i cant use any of these Examples

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      writingfrosh 5 years ago from Philippines

      Static electricity zaps you on a humid day as you scuff your shoes on the carpet and reach for that door handle...

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