It can be produced when an object is moved in a magnetic field, or is placed in a fluctuating magnetic field. A potential difference between two points produces an electric field, represented by electric lines of flux as you can see in below image. There is always a pole that is relatively positive, with fewer electrons, and one that is relatively negative, with more electrons. The positive pole does not necessarily have a deficiency of electrons compared with neutral objects, and the negative pole might not actually have a surplus of electrons with respect to neutral things.

But there’s always a difference in charge between the two poles. The negative pole always has more electrons than the positive pole. The abbreviation for volt is V. Sometimes, smaller units are used. The millivolt (mV) is equal to a thousandth (0.001) of a volt. The microvolt (μV) is equal to a millionth (0.000001) of a volt. And it is sometimes necessary to use units much larger than one volt. One kilovolt (kV) is equal to one thousand volts (1,000). One megavolt (MV) is equal to one million volts (1,000,000) or one thousand kilovolts. In a dry cell, the EMF is usually between 1.2 and 1.7 V; in a car battery, it is most often 12 V to 14 V. In household utility wiring, it is a low-frequency alternating current of about 117 V for electric lights and most appliances, and 234 V for a washing machine, dryer, oven, or stove. In television sets, transformers convert 117 V to around 450 V for the operation of the picture tube.

In some broadcast transmitters, kilovolts are used. The largest voltages on Earth occur between clouds, or between clouds and the ground, in thundershowers; this potential difference is on the order of tens of megavolts. In every case, voltage, EMF, or potential difference represents the fact that charge carriers will flow between two points if a conductive path is provided. The number of charge carriers might be small even if the voltage is huge, or very large even if the voltage is tiny. Voltage represents the pressure or driving force that impels the charge carriers to move. In general, for a given number of charge carriers, higher voltages will produce a faster flow, and therefore a larger current. It’s something like water pressure. The amount of water that will flow through a hose is proportional to the water pressure, all other things being equal.

Description of Electromotive Force

This force is measured in units called volts. Ordinary household electricity has an effective voltage of between 110 and 130; usually it is about 117. A car battery has an EMF of 12 volts (six volts in some older systems). The static charge that you acquire when walking on a carpet with hard-soled shoes is often several thousand volts. Before a discharge of lightning, many millions of volts exist. An EMF of one volt, across a resistance of one ohm, will cause a current of one ampere to flow. This is a classic relationship in electricity, and is stated generally as Ohm’s Law. If the EMF is doubled, the current is doubled. If the resistance is doubled, the current is cut in half.

It is possible to have an EMF without having any current. This is the case just before a lightning bolt occurs, and before you touch that radiator after walking on the carpet. It is also true between the two wires of an electric lamp when the switch is turned off. It is true of a dry cell when there is nothing connected to it. There is no current, but a current is possible given a conductive path between the two points. Voltage, or EMF, is sometimes called potential or potential difference for this reason. Even a very large EMF might not drive much current through a conductor or resistance. A good example is your body after walking around on the carpet.

Although the voltage seems deadly in terms of numbers (thousands), there are not that many coulombs of charge that can accumulate on an object the size of your body. Therefore in relative terms, not that many electrons flow through your finger when you touch a radiator so you don’t get a severe shock. Conversely, if there are plenty of coulombs available, a small voltage, such as 117 volts (or even less), can result in a lethal flow of current. This is why it is so dangerous to repair an electrical device with the power on. The power plant will pump an unlimited number of coulombs of charge through your body if you are foolish enough to get caught in that kind of situation.

Nonelectrical energy

In electricity and electronics, there are many kinds of phenomena that involve other forms of energy besides electrical energy. Visible light is an example. A light bulb converts electricity into radiant energy that you can see. This was one of the major motivations for people like Thomas Edison to work with electricity. Visible light can also be converted into electric current or voltage. A photovoltaic cell does this. Light bulbs always give off some heat, as well as visible light. Incandescent lamps actually give off more energy as heat than as light. And you are certainly acquainted with electric heaters, designed for the purpose of changing electricity into heat energy.

This “heat” is actually a form of radiant energy called infrared. It is similar to visible light, except that the waves are longer and you can’t see them. Electricity can be converted into other radiant-energy forms, such as radio waves, ultraviolet, and X rays. This is done by things like radio transmitters, sunlamps, and X-ray tubes. Fast-moving protons, neutrons, electrons, and atomic nuclei are an important form of energy, especially in deep space where they are known as cosmic radiation. The energy from these particles is sometimes sufficient to split atoms apart. This effect makes it possible to build an atomic reactor whose energy can be used to generate electricity. Unfortunately, this form of energy, called nuclear energy, creates dangerous byproducts that are hard to dispose of. When a conductor is moved in a magnetic field, electric current flows in that conductor. In this way, mechanical energy is converted into electricity. This is how a generator works. Generators can also work backwards. Then you have a motor that changes electricity into useful mechanical energy.

A magnetic field contains energy of a unique kind. The science of magnetism is closely related to electricity. Magnetic phenomena are of great significance in electronics. The oldest and most universal source of magnetism is the flux field surrounding the earth, caused by alignment of iron atoms in the core of the planet. A changing magnetic field creates a fluctuating electric field, and a fluctuating electric field produces a changing magnetic field. This phenomenon, called electromagnetism, makes it possible to send radio signals over long distances. The electric and magnetic fields keep producing one another over and over again through space. Chemical energy is converted into electricity in all dry cells, wet cells, and batteries. Your car battery is an excellent example. The acid reacts with the metal electrodes to generate an electromotive force. When the two poles of the batteries are connected, current results. The chemical reaction continues, keeping the current going for awhile. But the battery can only store a certain amount of chemical energy. Then it “runs out of juice,” and the supply of chemical energy must be restored by charging. Some cells and batteries, such as lead-acid car batteries, can be recharged by driving current through them, and others, such as most flashlight and transistor-radio batteries, cannot.

Description of Current

Usually, a great many charge carriers go past any given point in one second, even if  the current is small. In a household electric circuit, a 100-watt light bulb draws a current of about six quintillion (6 followed by 18 zeroes) charge carriers per second. Even the smallest mini-bulb carries quadrillions (numbers followed by 15 zeroes) of  charge carriers every second. It is ridiculous to speak of a current in terms of charge  carriers per second, so usually it is measured in coulombs per second instead. A  coulomb is equal to approximately 6,240,000,000,000,000,000 electrons or holes. A current  of one coulomb per second is called an ampere, and this is the standard unit of  electric current. A 100-watt bulb in your desk lamp draws about one ampere of current.

When a current flows through a resistance—and this is always the case because  even the best conductors have resistance—heat is generated. Sometimes light and  other forms of energy are emitted as well. A light bulb is deliberately designed so that  the resistance causes visible light to be generated. Even the best incandescent lamp is  inefficient, creating more heat than light energy. Fluorescent lamps are better. They  produce more light for a given amount of current. Or, to put it another way, they need  less current to give off a certain amount of light.  Electric current flows very fast through any conductor, resistor, or semiconductor.  In fact, for most practical purposes you can consider the speed of current to be the  same as the speed of light: 186,000 miles per second. Actually, it is a little less.

Description of Static Electricity

You don’t feel this until you touch some metallic object that is connected to earth ground or to some large fixture; but then there is a discharge, accompanied by a spark that might well startle you. It is the current, during this discharge, that causes the sensation that might make you jump. If you were to become much more charged, your hair would stand on end, because every hair would repel every other. Like charges are caused either by an excess or a deficiency of electrons; they repel. The spark might jump an inch, two inches, or even six inches. Then it would more than startle you; you could get hurt. This doesn’t happen with ordinary carpet and shoes, fortunately. But a device called a Van de Graaff generator, found in some high school physics labs, can cause a spark this large (you may check the below image). You have to be careful when using this device for physics experiments.

In the extreme, lightning occurs between clouds, and between clouds and ground in the earth’s atmosphere. This spark is just a greatly magnified version of the little spark you get after shuffling around on a carpet. Until the spark occurs, there is a static charge in the clouds, between different clouds or parts of a cloud, and the ground. In the below image you might see cloud-to-cloud (A) and cloud-to-ground (B) static buildups are shown. In the case at B, the positive charge in the earth follows along beneath the thunderstorm cloud like a shadow as the storm is blown along by the prevailing winds. The current in a lightning stroke is usually several tens of thousands, or hundreds of thousands, of amperes. But it takes place only for a fraction of a second. Still, many coulombs of charge are displaced in a single bolt of lightning.

It has optional processors of 2.83Ghz Intel Core i3-530 or 3.2GHz Intel Core i5-650 technology with the memory support of 8GB of RAM. You will get a huge storage capacity with 1TB of Hard Drive support. Additionally it sports a DVD burner, a choice of SSD, Wi-Fi support, Bluetooth interface, Gigabit Ethernet, six ports of USB interface and in last but not the least it comes with the pre-loaded version of Windows 7 Professional Operating System.

The All-in-one Lenovo ThinkCentre M90z is available with the initial price rates of $899. A pretty much expensive one but it deserves it because of its outstanding features .

via techfresh

It is 2.5 inches hard drive with high performance compact system . It is now available only with 320GB of storage capacity. We have no specific information about its price rates but we will surely place here whenever we get any update. 

via techfresh

If talking about Blockbuster on Demand so it facilitate you to watch the latest videos on the same day they release with monthly charges on DVD or Blu-ray. Whereas Netflix allows you to watch thousands of high definition TV episodes and movies just directly on their HDTV’s. Vudu will also provide you to access over three thousand of HD videos on demand. BDX2500 and BDX2700 Players  will be able to stream wide range of music from Pandora web based radio.

Additionally both these blu-ray players sports a Full support of HD 1080p/24fps blu-ray playback with up-conversion DVD standard. It also have SD/SDHC card slot and a USB interface. If you want to buy Toshiba’s BDX2500 and BDX2700 blu-ray player then you may have it for $179.99 and $249.99 respectively.

via techfresh

Additionally it boast a 256 MB of Ram and an integrated 4GB flash memory, Wi-Fi and 3G(optional) support, Bluetooth interface, SDHC card reader, Gigabit Ethernet interface, it comes with a two set of speakers. It comes with a Linux OS and a battery which remains up to 8 hours. Shogo Open Tablet will going to be available in the market at the end of August and you may have it for $500 retail price. 

via techfresh

We are waiting for further details on this and it might come out after the Computex event so you just stay tuned with us for further updates.

via techfresh

This eRoll E-book gadget consist of a tube from which the OLED based paperthin screen is pulled out. On the right side of the screen quick navigation buttons are place which will be controlled by the thumb of a person. But as we said the screen is paperthin and it looks awkward when someone try to read the contents on screen of multi-touch gestures  without placing the device down on a solid surface. 

[via Geeky Gadgets]

Reportedly latest Apple TV will be based on iPhone 4.0 firmware and it will boast the same A4 CPU with limited storage feature of 16 GB only . You will be able to run HD videos at 1080p. This new technology will come with low amount of ports ( the power and video output port only).

While streaming the content, users will be able to connect the Apple TV with a Time capsule for external drive storage. As mentioned above the new Apple TV will based on iPhone OS but we are not aware of either it will support App Store applications or not. There is no ETA for Apple TV yet but as different rumors are running on that Apple TV could be presented on during WWDC 2010.

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This phone comes with Bluetooth Headset which makes  your call easier to attend by attaching wireless headsets , also we can use microphone as it is already built in it, if we prefer .  Next comes towards its Multimedia features which allows this phone to play many different  movies format such as MPEG4 (AVI),3GP and all sorts of music formats which includes MP3,MP4,WMA,WAV. it also has spy voice recording function  and Camera which is capable of taking photo and recording Videos. As far as its storage is concerned , this phone use MicroSD slot  which is capable to support up to 2GB of memory. One amazing fact related to its perform is this that ,its comes with Li Ion Battery which can be charged via USB.

NB30 Pro Netbook comes with a special designed durable casings and it has water resistant keyboard to protect against the damage . Lets moving on to the Core Features of netbook so it boast a processor of Intel Atom N450, and as we mentioned above it comes with Windows 7 Professional OS. It facilitates us up to 2GB of DDR2 memory with the storage capacity of 160GB(max) Hard Disk. It has a display screen of 10.1 inches with the resolution support of 1024 x 600. In graphics option it boast with Intel GMA3150 graphic card .

Additionally it features an audio technology of HD audio and it comes with the bundle of 1.5W x 2 speakers. It equips three interfaces of USB 2.0 ports, 0.3mp webcam, 10/100 Ethernet LAN support. It works up to 6 hours of battery support and it is weight about 2.73lbs.

You might thinking of it has high price rates but not exactly because it will be available for $519 at the end of May.

via pclaunches

Additionally it comes with the internal memory of 4GB along with microSD card slot. It has an integrated Li-ion rechargeable battery and those who are interested in getting Motion-Activated Clock Spy Camcorder so they can buy it for $48.99 .[Buy it From Here]

Additionally it has a video processor of Victoria Engine along with Optical Stabilization. This exclusive camcorder supports DLNA functionality and you will easily transfer your pictures and videos to DLNA supported PC or TV through Wi-Fi support. South Korean people will surely get Samsung HMX-S16 just for 1,399,000 Won (about $1,155) of price rates.

via techfresh

In Gaming PC’s the basic performance is depend upon its graphics support and it has Intel GMA X4100 in standard form , but you may also get the advantage of upgrading the Graphic support  by adding up NVIDIA GeForce GT240 graphic card into it. In addition it boasts audio support of Realtek ALC663 and an optional feature like Blu-ray drive.

Shuttle J1 4100G SFF is available in the US market to purchase and those who are interested they may grab it for $889.

via Geeky Gadgets

The function or supporting period of the amp is approx 8 hours with the support of rechargeable battery, that means you may keep it away with you anywhere you wish to. Its appearance is looks like a heavy duty small suitcase with a metallic material and a small sturdy handle is fixed on the top which may facilitate you to carry these speakers away with you. In addition it has a built-in support of iPod dock and it will work with all iPod generations except ( 1st 2nd or 3rd) . It equips an input panel for a guitar/ bass and has attached an indicator which will indicate about battery level along with an included microphone. Suppose if you are fed up with using rechargeable batteries then you may have another advantage and you can use external power cable too. If you are now looking towards to buy this awesome product the you may Buy it for $225 From Here

via coolest gadgets

Some new features it has are;

· 2GB of GDRR5 memory fro high frame rates and image quality settings.

· Full display flexibility after coming out of the box, two mini display ports one for HDMI and other for DVI

· Supports 3 * 2 display configurations that are also supported with upcoming ATI Catalyst software updates.

· Support for software developers worldwide.

· Ability to use multi GPU technology and also have drive version of 10.2

It is going to be expensive but before thinking about the money you should think about the advantages you will have, the performance enhancements you will get in return. Just think about it.

via  Tuvie

The working of the pill is simple.When a patient takes the pill, the digestible antena in the pill communicates with the second main element , which is a small electronic device either worn by the patient itself or some other responsible person is chosen. So it informs the patient or the doctor about the ingestion of the pill.The pill doesn’t require any battery as the stand alone device sends it power through a very low-voltage. When the pill reaches the stomach so, antena informs the device through signals that the pill has ingested.

The test are also done on human models so there are no side effects and this type capsule will definitely prove to be helpful for the people in taking their medicines at proper times.

Via-Gizmag