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Topic: Ground (electricity)

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  Ground loop (electricity) - Wikipedia, the free encyclopedia
In an electrical system, ground loop refers to a current, generally unwanted, in a conductor connecting two points that are supposed to be at the same potential, that is, ground, but are actually at different potentials.
In a floating ground system, that is, one not connected to Earth, the voltages will probably be unstable, and if some of the conductors that constitute the return circuit to the source have a relatively high resistance, or have, flowing through them, high currents that produce a significant voltage (I·R) drop can be hazardous.
In this case the video cable is grounded at the projector end to the home electrical system, and at the other end to the cable TV's ground, inducing a current through the cable which distorts the picture.
en.wikipedia.org /wiki/Ground_loop_(electricity)   (656 words)

 Ground (electricity) - Wikipedia, the free encyclopedia
The ground wire is also usually bonded to pipework to keep it at the same potential as the electrical ground during a fault.
In an electrical circuit operating at signal voltages (usually less than 50 V or so), a common return path that is the zero voltage reference level for the equipment or system.
Grounding is primarily used for safety to prevent electric shock or fires caused by a voltage potential between the earth and a conductor such as an appliance cabinet or chassis.
en.wikipedia.org /wiki/Ground_(electricity)   (979 words)

 Electricity Today Magazine Article -- Power System Data Communication Architecture at BC Hydro
A grounding system that is properly designed, and properly installed, will insure the operation of critical equipment from the hazards of transients, harmonics, and the most ultimate of transients, the lightning strike.
A ground electrode is "a conductor or group of conductors in intimate contact with the earth for the purpose of providing a connection with the soil".
A 4-point ground meter is utilized to determine the conductivity of the soil and provide a basis for the beginning of the ground system.
www.electricity-today.com /et/issue0601/i06_grounding.htm   (1817 words)

 Howstuffworks "How Electricity Works"   (Site not responding. Last check: 2007-10-21)
It is easy to create electricity from sunlight using a solar cell; or you can create electricity from the chemical energy in hydrogen and oxygen using a fuel cell.
In an electrical circuit, the number of electrons that are moving is called the amperage or the current, and it is measured in amps.
In the case of lightning, there is so much electrical energy stored up between the cloud and the ground that, eventually, the energy is able to rip the electrons off the atoms in the air.
electronics.howstuffworks.com /electricity8.htm   (1193 words)

 ESD Journal - Grounding the Human Body
o effectively restore ground contact for an extended period, test subjects slept on dissipative carbon fiber mattress pads placed under their fitted sheets, connected via a ground wire [protected with an inline 1/100 amp fast blow fuse], to a ground rod driven into the earth near their bedroom window.
The grounded mattress pads were designed to replicate the ground plane of the earth in the bed.
The important finding of this study is that the human body when grounded is naturally protected from static electricity and the weak electric currents created in the body by radiated electric fields.
www.esdjournal.com /articles/cober/ground.htm   (1623 words)

 Staying grounded: Safely ground electricity when arc welding
Grounding the enclosure also limits the voltage on the enclosure in case the equipment's insulation fails.
When asking yourself whether or not the generator frame should be grounded, consider that the rules for grounding depend on the specific use and design of the auxiliary power generator.
The frame of the generator is bonded, or electrically connected, to the truck or trailer frame.
www.thefabricator.com /ArcWelding/ArcWelding_Article.cfm?ID=1287   (1317 words)

 Bad Electricity
Now, almost all electrical power in the United States is generated with a sinusoidal voltage that oscillates from the peak voltage of +170 volts to - 170 volts and back to + 170 volts at the rate of 60 times each second.
The goal of the ground wire is to provide a permanent path from the case to the ground.
Since the ground wire has much smaller resistance than your body, the instant the naked hot wire gets in contact with the case and thus with the ground, the current in the frayed hot wire will increase enormously, causing the fuse to blow immediately.
www.jal.cc.il.us /~mikolajsawicki/ex_electr.html   (990 words)

 PC911 - Friendly Computer Help In Plain English
Electrical power refers to how much energy is expended performing work, and is equal to the current (amperes) multiplied by the force (volts), and is measured in watts, for example: 12 volts X 5 amperes = 60 watts.
In this case ground is just a common point where power supplies and metal supports such as a case or chassis are connected together, a common reference point.
There is a lot more we could go into such as electrical resistance, measured in ohms, and electrical storage, or capacitance measured in farads, but for the most part they are beyond the needs of our discussion here, and I can sense your eyes starting to glaze over.
www.pcnineoneone.com /howto/electricity1.html   (826 words)

 "Grounded" Electricity
Grounding of RF equipment has to do with antennas, the earth acts like a large slightly imperfect mirror and vertical antennas form half the total (the mirror the rest) which is why many such antennas are 1/4 wave as opposed to what they should be 1/2 wave.
With the case grounded, the electricity from the hot wire flows straight to ground, and this trips the fuse in the fuse box.
Grounding is basically a term, and while yes homes generally have a ground point somewhere that is planted in the earth, as was mentioned, this is merely for safety purposes.
www.physicsforums.com /showthread.php?t=35199   (1768 words)

 Electricity Regulation gets off the ground
The primary objective of the new regulatory regime as enacted in the Electricity Act is to move from the vertically integrated industry model with monopolies at all segments of the ESI value chain to an industry model that fosters competition in generation, distribution and supply of electricity.
The complexity of the Namibian electricity sector in terms of its legal, technical and economic foundations was never fully appreciated in the past and only became apparent when stakeholders, including the ECB, had to scramble to meet and comply with the requirements of the Act.
The electricity supply industry is at the threshold of a new dispensation that shall entail greater competition in generation and supply, wider customer choice, transparency, a favourable investment climate and strong environmental awareness as top priority.
www.klausdierks.com /Energy_Regulation   (3400 words)

 Fizzics Fizzle: Intermediate: Electricity and Magnetism: Static Electricity
An electric field is a region where electrical force acts on a charge.
If an electric field repels a charged particle from a certain direction, work must be done to move the particle in that direction.
Electric potential is the work per unit charge that is needed to move that particle.
library.thinkquest.org /16600/intermediate/staticelectricity.shtml   (972 words)

 Measuring high voltage or the "static electricity" on your body.
ground, hold the other meter lead in your hand, scuff on the rug, and watch the voltage-reading on the meter as it climbs up to several thousand volts.
TO do this, first use a small DC motor to whirl a grounded wire, then place an oscilloscope probe behind the whirling wire so it is alternately shielded and unshielded, mount the entire assembly an inch or so from a large, electrically floating brass ball, then observe the scope trace.
In the gap between the balloon and my arm-hair, we have electric field strength which is easily the same as the field strength at the surface of the sphere of a VDG machine.
amasci.com /emotor/voltmeas.html   (2095 words)

 The Energy Story - Chapter 10: GEOTHERMAL ENERGY
Holes are drilled into the ground and pipes lowered into the hot water, like a drinking straw in a soda.
The turn turns the generator, and the electricity goes out to the transformer and then to the huge transmission wires that link the power plants to our homes, school and businesses.
In winter, heat from the warmer ground goes through the heat exchanger of a heat pump, which sends warm air into the home or business.
www.energyquest.ca.gov /story/chapter11.html   (1113 words)

The ground wire is disconnnected to prevent the return of the electrons
Electric potential and voltage are the same thing.
The pair of charges has more electric potential energy when their separation is smaller.
sol.sci.uop.edu /~jfalward/physics17/chapter8/chapter8.html   (394 words)

Ground (electricity), in electrical engineering, something that is connected to the Earth or at the voltage defined as zero (in the US, called ground; in the UK, called earth)
In music, a ground bass is a bass part that continually repeats, while the melody and harmony over it change
In symbolic logic, a "ground term" is a term with no variables.
www.brainyencyclopedia.com /encyclopedia/g/gr/ground.html   (238 words)

 Controlling Static Electricity - Stop Getting Shocks - Succeed in Physical Science
The way to reduce the problem of excess static electricity is to try to get more humidity in the air, change the materials or modify their surface, and ground yourself before touching things, whenever possible.
Thus, the truck uses a grounding device on the hose that draws the electrical charges away from the gasoline, preventing any static sparks from occurring.
Grounding is also used to prevent sparks from damaging computers and houses and causing explosions.
www.school-for-champions.com /science/staticcont.htm   (2057 words)

 Sweetwater inSync
In electricity, a large conducting body, such as the earth or an electric circuit connected to the earth, used as a reference zero of electrical potential.
In the event of a failure or circumstance that might normally cause the operator (or anyone coming in to electrical contact with connected equipment) to be the return path for the electrical current the ground can shunt this current away safely and return it to earth, which is where it is trying to go anyway.
Many audio devices have the ability to disconnect their signal paths entirely from electrical ground as a way to prevent hum or ground loop problems.
www.sweetwater.com /insync/word.tpl?find=Ground   (313 words)

 Electricity safety 101
Electricity will flow through you, and you could be seriously hurt or killed.
You don’t have to be touching the ground directly to conduct electricity.
It’s because the electricity is always looking for a way to get to the ground, but the birds are not touching the ground or anything in contact with the ground.
www.ci.longmont.co.us /lpc/safety_edu/NESM/electricity_safety_101.htm   (645 words)

 Electricity and Magnetism - List Of Demonstrations   (Site not responding. Last check: 2007-10-21)
One terminal of the capacitor is connected to ground and the other to the electroscope.
Touch the outside of the pail to ground and note no deflection on the electroscope.
It is considered to be a prototype of the electric motor.
info.phys.uvic.ca /dbr/resman/electricity_and_magnetism.html   (1796 words)

 Encyclopedia :: encyclopedia : Electronics   (Site not responding. Last check: 2007-10-21)
The field of electronics is the study and use of systems that operate by controlling the flow of electrons or other electrically charged particles in devices such as thermionic valves and semiconductors.
The main uses of electronic circuits are the controlling, processing and distribution of information, and the conversion and distribution of electric power.
While electrical energy had been used for some time to transmit data over telegraphs and telephones, the development of electronics truly began in earnest with the advent of radio.
www.hallencyclopedia.com /Electronics   (552 words)

 Electricity in the Woodshop
By comparing electrical terminology to water flowing in a pipe, we should be able to gain a deeper understanding of electricity.
But the main purpose of the ground wire is to always ensure that the chassis of the appliance remains at zero volts.
A shared ground system is one where their is a ground wire or path which is common to all panels.
home.att.net /~waterfront-woods/Articles/Electricity/electricity.htm   (12716 words)

 :KIDS' ZONE::Electricity:
the light in your bedroom, you are using electricity.
The same immense pressure throughout time turns the fossilized plants into coal, which is mined and then also burned to produce heat energy and boil water.
The turbine, spinning away, is connected to a generator that produces large amounts of electricity.
www.aecl.ca /kidszone/atomicenergy/electricity/index.asp   (569 words)

 Ground -   (Site not responding. Last check: 2007-10-21)
Ground (electricity), in electrical engineering, something that is connected to the...
Ground covers, low-growing plants used in the landscape, are popular as mass plantings for covering large areas.
Ground water is widely used as a source for public water supply...
ground.greatestofthewww.com   (1035 words)

 How Ground Fault Protection Works at DoItYourself.com
A ground fault circuit interrupter is an inexpensive electrical device that, if installed in household branch circuits, could prevent over two-thirds of the approximately 300 electrocutions still occurring each year in and around the home.
An unintentional electric path between a source of current and a grounded surface is referred to as a "ground-fault." Ground faults occur when current is leaking somewhere, in effect, electricity is escaping to the ground.
In homes built to comply with the National Electrical Code (the Code), GFCI protection is required for most outdoor receptacles (since 1973), bathroom receptacle circuits (since 1975), garage wall outlets (since 1978), kitchen receptacles (since 1987), and all receptacles in crawl spaces and unfinished basements (since 1990).
www.doityourself.com /stry/gfci   (1192 words)

 Hyper Ground System — by Sun Automobile :: Sigma Automotive
The resistance disturbs this flow of electricity to a degree that electrical components such as computer, lamp and spark plugs cannot perform at their peaks.
EGS can achieve an extreme improvement on electricity flow and stability by providing a direct ground path from the body, chassis and engine components to the battery negative.
Installation: Each kit comes with 2 ground straps; one is connected from the exhaust where the muffler bolts on the midpipe to the chassis, and the other is connected from the exhaust where the midpipe bolts on the cat.
www.sigmaautomotive.com /EGS/egs.php   (1328 words)

 The Electricity Forum Training Institute Course - Electrical Grounding For Industrial, Commercial and Institutional ...
Without proper grounding, sensitive electronic equipment is subjected to destruction of data, erratic equipment operation, and catastrophic damage.
Without good grounding, sensitive electronic equipment is subjected to destruction of data, erratic equipment operation, and catastrophic damage.
With the practical application of the Electrical Code (CEC) and electrical grounding practices, and minimization of probabilities of mis-operation or loss of equipment with all its collateral damage, the cost of the course will be amortized many times over.
gstgrounding.com /electricalforum.html   (1036 words)

 RedOrbit - Space - Coping with Static Electricity in Space
Ground rods work well in most places on Earth because several feet deep the soil is damp, and is thus a good conductor.
So ground rods would be ineffective in establishing a neutral "common ground" for a lunar or Martian colony.
Instead, a common ground might be provided by burying a huge sheet of foil or mesh of fine wires, possibly made of aluminum (which is highly conductive and could be extracted from lunar soil), underneath the entire work area.
www.redorbit.com /news/display/?id=205707&source=r_space   (923 words)

 In its drive towards enhanced customer service
Electricity flows from the wires in the wall, through the plug’s metal prongs, and through the appliance cord to the motor of the appliance.
So, while electricity doesn’t actually come from the little holes in outlets, it is waiting inside the outlet to be used — much like water waits in pipes for you to turn on the faucet and let it flow.
Electrical shock may cause burns inside the body, so be sure the person is taken to a doctor.
www.apeasternpower.com /misc/safety.jsp   (1978 words)

 World Electric Power Guide
It includes a table describing electrical systems worldwide, illustrations of electrical plugs you may run across, advice on using your computer and other general advice that you may find helpful.
If you are going to use electrical appliances in another country, you need to know what type of electrical voltage is used in the country you're traveling to and the type(s) of plugs and outlets used there.
Also, since the quality of electrical power might be an issue, a Universal Surge Suppressor might be a goody buy, especially one that includes plug adaptors that will work in most of the world.
kropla.com /electric.htm   (1164 words)

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