Static Electricity and Computers
|Whenever the casing of a computer is opened and its internal workings are exposed — to change a hard drive or add memory chips for example — there is a danger of damaging the computer with the buildup of static electricity that is held by the human body.
The internal workings of a computer, and especially the hard drive, are extremely susceptible to static electricity, which can cause considerable damage to the hard drive if it is zapped with even a small amount. Microchip damage can occur if it is exposed to static electricity as low as 10 volts, and humans are not able to perceive static electricity until it has reached about 1,500 volts.
Walking across a rug can produce a static electricity voltage of up to 12,000 volts, but static voltage is not life threatening. So it is possible to damage a hard drive with static electricity that is not even felt by the person because it is at such a low voltage. Also, computers become increasingly susceptible to static electricity damage as more and more circuitry is built into them.
Static electricity is caused by a process called triboelectrification. Everything around us, and including us, is made of atoms, and every atom has in its center (nucleus) positively charged protons and neutrons, which have no electrical charge. Surrounding the atom are negatively charged electrons. The protons and neutrons in an atom do not change, but the electrons can move from one atom to another. When two objects touch, they exchange electrons, which causes one object to become electrically positive and the other to become electrically negative. When an object touches another object with either an opposite or neutral charge, electrons flow. Static electricity is created when electrons move back and forth between atoms.
To avoid zapping your components with static electricity, take precautions to ground the static electricity before touching any of the internal components of the computer. Wearing an ESD wrist strap or working on an anti-static mat will prevent any static electricity from damaging your computer. Another way to ground the static electricity is to touch the internal metal frame of the computer's case while the computer is plugged into an electrical socket. The static electricity will be discharged and grounded as the electrical circuit is grounded via the AC outlet. And to be on the safe side, always handle the electronic circuitry on the motherboard, video card, modem, sound card, hard drive and other internal components by any insulated, non-circuitry areas if they have them to insure that you do not send a bolt of static electricity coursing through it.
An important exception to this rule is when working inside monitors. You should not ground yourself before working inside a monitor. Monitors store electricity in capacitors, and by grounding yourself you will provide a conduit for the voltage to discharge through your body.
Note: A CRT monitor stores enough electricity in its capacitors to be lethal if released, often tens of thousands of volts. Even with the power off and/or the monitor disconnected from a power source, the monitor retains an extremely high electrical charge. Only a trained professional using the proper equipment should ever attempt to work inside of a computer monitor.
|Key Terms To Understanding Static Electricity:||Related Articles on Webopedia:|
Keeping track of big data trends, research and statistics gives IT professionals a solid foundation to plan big data projects. Here are 15... Read More »Enterprise Storage Vendors
There's a number of vendors that sell enterprise storage hardware or offer cloud-based enterprise storage. View Webopedia's Enterprise storage... Read More »50 Cloud Computing Terms Defined
From planning a private cloud project to finding an online cloud storage provider, Webopedia's A-Z Cloud Computing Glossary will help you... Read More »
- Enterprise Mobility Exchange results show continued growth and emphasis on mobility. CIOInsight breaks down the numbers here. »
- Watch Datamation's editor James Maguire moderate roundtable discussions with tech experts from companies such as Accenture, Dell, Blue Jeans Network, Microsoft and more »
From the widest view, everything that we include under the heading of mobile has irrevocably changed IT's relationship with the rest of the... Read More »Choosing an Enterprise Storage Implementation
When you deploy a new enterprise storage system, you must decide whether to design and build your own storage system or to utilize a cloud-based... Read More »Big Data Analytics Expert Predictions
In this Webopedia Did You Know...? article we look at three big data expert predictions for 2014. Read More »