Showing posts with label Electrical. Show all posts
Showing posts with label Electrical. Show all posts

Saturday, March 10, 2012

MAGNETO-OPTICAL CURRENT TRANSFORMER (EEE)

moct-ppt
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Saturday, January 7, 2012

Hybrid Electric Vehicle

Hybrid Electric Vehicle
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Thursday, December 1, 2011

GE to Open New Global Software Headquarters in Bay Area, Hire 400 Software Engineers

REVOLUTIONIZE THE MODERN AGE



As the Internet evolved from the dial-up days of America Online to the always-on, cloud-dwelling social network, a parallel development has been taking place in the background: the digital web of the world’s trillions of machines.
Over the last several decades, GE’s software engineers have guided the growth of this emerging industrial Internet. Putting their brains and manufacturing skills to the task, they connected jet engines, power transformers, and medical devices to boost the efficiency of these complex systems and save customers money. With some 5,000 software engineers on staff, GE’s software revenues are about $2.5 billion and the company expects double-digit growth from now until 2015.
Today, GE announced what would be a new dynamo powering this growth: a new Global Software Center, located in San Ramon, California. The center will hire and house 400 software engineers and other professionals developing digital tools that gather and analyze the millions of gigabytes of data generated by controls, sensors, computers and other parts of the brains of industrial machines. These tools will predict and respond to changes, and guide customers in how to best use their assets.
It’s the kind of work that went into GE’s rail Movement Planner and Trip Optimizer. The program gets locomotives to talk to each other, loop in traffic control systems, freight loaders, and technicians with their smartphones. This is no idle talk: a railroad can increase speeds up to 20%, cut fuel consumption by 10%, and save as much as $200 million in capital and expenses annually.
The San Ramon facility will be GE’s “nerve center for software” and link to other GE businesses and software engineers. Mark Little, GE’s Chief Technology Officer, says that the center will promote collaboration across GE and its diverse group customers. “On any given day, one of our software experts could be working on a clean energy project, while at the same time contributing to a program that improves the delivery of health care,” says Little.

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Sunday, November 27, 2011

Resistive Vs Capacitive Touch Screen


No doubt touch screen is the making it nice rapidly in the field of technology. A device with touch screen is preferred as compared to the device without touchscreen. Everything with a display is now changed into touch display like watches, monitors, laptops, iPhones, MP3s; whatever you think with a display is available in touch screen mode.

Touchscreen is not only single module. There are different types of screens available in market whose touch mechanism is different from one another. Most known touch screen are two types and here we are supposed to discuss the comparison and contrast between the two. It is better to have enough knowledge about two of them so that we should be aware enough to make a right choice according to our demand.

These two types are Resistive and Capacitive touch screens.
Here are the Similarities and Dissimilarities between two types of touchscreens depending upon its various features;

Appearance 

General appearance of both types is same as both are used for display. While seeing them in off-mode there seem no particular difference.

Display 

Display of both types is available in various sizes but resistive has been even more versatile than capacitive. For example a projector with capacitive touchscreen is not as effective as of resistive touchscreen because our hand does not reach some of the areas on projector which are higher than our height.


Mechanism 

Resistive touchscreen is Pressure sensitive while Capacitive touchscreen is HID (Human Interface Device or responsive to the conductive material. When we apply pressure on resistive touchscreen they strike because of the space between two layers and locate the point of touch to carry out the desired command while outer layer on the glass protect the screen from damaging its mechanism.


Clarity 

Capacitive touchscreen is made of capacitive layer with static charge. So glass panel in capacitive touchscreen is more exposed as compared to resistive touchscreen. Now see, resistive layer is made up of three layers so restrict the full emission of light (75 %) from screen which results into bulky image. On the other hand capacitive screen emits 90 % of light as there is only one layer. In short, capacitive touchscreen gives clearer image than resistive touchscreen.

Responsiveness  

Capacitive touchscreens are more responsive than resistive touchscreens. Pressure applies by different personae make its mechanism weak and with the passage of time it needs more pressure than normal.


Durable

Resistive touchscreen is durable than capacitive. Directly expose, the glass panel of touchscreen starts damaging while resistive touchscreens are made up of three layers which helps to protect the glass panel and therefore durable.


Usability

Resistive touchscreen is easy to use as it can be operated with any object in hand like stylus etc. But capacitive touchscreen is only operated by finger ouch because it is human interface device. Therefore it is not prefer to use at higher level where stylus is desired to use. Capacitive touchscreen is not responsive to stylus, gloves or other object. It just senses finger touch or an object made up of conductive material.


Versatility

Touchscreen devices are in demand so are making in variety of range. Here again resistive touchscrens are available in wide rang because of its durability and easy to use but capacitive touchscreen devices like mobiles, laptops and watches are gaining much popularity.


Price 

When it comes to the price, capacitive win the race but winning this race loses its niche. People prefer to go for comparatively less expensive resistive touchscreen mobile or whatever they want to purchase.

A comparison of both types of touchscreen is before you, now it’s up to you which medium you like or prefer to purchase. Presently accessories are introducing with capacitive touchscreen so there is no doubt that if not the whole horizon even then for intimate use capacitive is gaining its niche in the future market.



K@run@

Saturday, November 26, 2011

Mobile Charger Working

Mobile Phone Charger Insight2


When charger is connected with the AC supply, the LED starts glowing to indicate the proper operation of the charger.
 
Working
Latest mobile chargers are kind of power supply units that use the Switched Mode Power Supply (SMPS) technology. To understand the working phenomenon of a mobile charger, we need to understand the concept of Power Supply Unit (PSU). PSU is a device that transfers electrical energy from one end to another by changing its fundamental characteristics according to the requirements. Example of a PSU is an application that converts AC mains voltage to regulated DC voltage. PSUs can be of two types depending on the mode of operation – Linier and Switching.
 
In these switching mode chargers, energy transfer is done by continuously switching electrical components (inductor, capacitor, etc) on and off. We can control the output voltage/current by varying the duty cycle, frequency or the corresponding phase. Using the SMPS technology makes the chargers smaller and lighter by elimination of low frequency transformers. It also presents a greater efficiency than the conventional methods which uses bulky transformers.
 
The AC supply first enters through the line filters in the charger. Line filters are the kind of electronic filters that are placed between an electronic device and an external line to alter/attenuate the electromagnetic interference effect. Now filtered signal are made to pass through the full wave bridge rectifier circuit. Rectifier converts the AC voltage to DC.
 
Output DC voltage from rectifier circuit passes through the PFC (Power Factor Correction) circuit which operates power circuits at their maximum efficiency. Further the voltage signal is transferred to the pulse transformer that is a special type of transformer optimized to produce rectangular electrical pulses.
 
Pulse transformers are categorized into two categories – power and signal transformers. The one used here is a power transformer. It reduces the voltage level of the input power and gives a low voltage power that is exactly required to charge the battery.

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Wednesday, November 23, 2011

Capturing Electricity With a Shoe


Electric Slide Liquid moves between the bladders. As it does, the flow is converted into electricity. 

Humans are not very efficient. When we walk, we waste close to 20 watts of energy per second. Instead of turning all calories into lift or forward motion, we turn most of them into heat that’s quickly dissipated. So my colleagues and I came up with a way to harvest the wasted energy from human motion and convert it into about 10 watts of electricity.
Our device is based on a physical phenomenon called electrowetting: If you apply electrical voltage to certain liquids, the liquid moves. This means you have converted electrical energy (the current) to mechanical energy (the liquid in motion). We reversed the process, forcing liquid to move over electrodes. In the shoe, you have two flexible plastic bladders, one under the heel and the other under the toe. The bladders are filled with a mixture of oil and water and connected by a thin, snaking tube. When you step down on your heel, you compress the rear bladder, and several milliliters of liquid travel through the tube to the front bladder. Step on the toe, and the process is reversed.
The tube is lined with a thin film of electrodes, and as the liquid slides back and forth, the electrodes charge—electrowetting in reverse. A small battery stores the energy, and you can access that energy by way of a micro-USB port on the heel of the shoe. We also invented a way, like Wi-Fi, to transfer power from shoe to cellphone battery. Military or police might like having a regular supply of power, but I suspect most people wouldn’t be happy dealing with wires connected to their footwear.

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Wednesday, October 5, 2011

AC vs DC

watch this and you can understand the difference between Alternating and direct current using a kyp bulb.
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Flywheel Energy Storage


If we are going to retool our electric grid to incorporate more renewable energy sources, we need to find better ways of storing energy. One solution that has been talked about for decades is the use of flywheels: large, heavy wheels that store energy by spinning rapidly and release it through a generator that converts it back into electricity. The upshot: A utility can swiftly ramp up supply or taper it off to meet demand. After years of false starts, the first large-scale flywheel plant is set to open in 2011. Beacon Power’s 20-Mw plant in Stephentown, New York, features 200 flywheels, each with a magnetically levitated rotor that spins at up to 16,000 rpm.

Read more: 10 Tech Concepts for 2011 - Technology Terms - Popular Mechanics 

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Saturday, September 17, 2011

RECTIFIER

Simple rectifier i.e. Ac to DC by using simple P-N junction diodes.
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Friday, September 9, 2011