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Digital Volt
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 DIGITAL LED 12V /24V CAR TRUCK SYSTEM VOLTMETER VOLTAGE GAUGE Volt Meter  US $6.19
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Panasonic DVD Player Battery. Specifications: Capacity: 4000 mAh., Technology: Li-Ion, Volts: 7.2 Volts. This Battery is for Panasonic Digital Camera models. List Price: $27.99 Sale Price: $25.99 |
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Panasonic DVD Player Battery. Specifications: Capacity: 4000 mAh., Technology: Li-Ion, Volts: 7.2 Volts. This Battery is for Panasonic Digital Camera models. |
Here are some more information for Digital Volt:
UPS VA is the common figure used to appraise UPS Size. New computers, designed to comply with recent green oriented standards, feature input power factor correction which requires considering UPS Watt capacity when sizing a UPS.
Two figures Volt - Ampere (VA) and Watt (W) define Uninterruptible Power Supply capacity. Both should be above corresponding load requirements.
VA represents the total (sometimes called apparent) Power, derived simply by multiplying Main's Voltage by consumer's Current (Amperes).
Watt figure represents theTrue power, required by the computer power supplies, derived by multiplying Main's Voltage by the value of Main's frequency Current component. The ratio of Watt to VA is defined as Power factor (PF).
Normally, Computer Power Supply's input current has a pulse shaped waveform. This current comprises basic mains frequency sinusoidal component of about 0.7 (70 %) of total current and also parasitic higher harmonics, which increase input current but do not contribute to the power which the Computer Power Supply can deliver.
Thus, a standard 120V server drawing, for instance, 2.5A from the mains, has input power rating of 300 VA (120V x 2.5 A) and 210W (300VA x 0.7), and requires at least 300VA/ 210W UPS.
Recent movement towards a green world affects also legislation of server power supplies, demanding to increase server's efficiency and decrease pollution of grid by elimination of unwanted current harmonics. New computer power supplies, which implement power factor correction to achieve sinusoidal input current with almost unity power factor, are the common trend.
Latest regulations, such as Energy Star, require server input power factor figure to be above 0.95 at full load. Thus, a new 120V server drawing 2.5A from mains may require 300VA and 285Watt (300VA x 0.95 PF).
The right UPS rating, to drive such server, should therefore be at least 300VA/ 285Watt. Most 300VA UPS systems are designed to supply maximum 210 Watt loads, and will not be able to feed a load that requires 285 Watt. Before buying a new UPS its Wattage capacity should be verified, to ascertain that it meets not only the VA but also the Watt requirements.
If the UPS feeds more than a single server, both total UPS Volt Ampere and Watt ratings should be above the respective VA and Watt sums of the individual servers.
Connecting to a UPS consumers that require real power Wattage, above the rating which the UPS supports, might damage UPS's Inverter semiconductors due to overheating, cause complete battery destruction, and expose the UPS and the critical load to various, severe phenomena harming the UPS as well as the load which it aims to protect.
Mind the Watts, when Sizing a UPS
Load Volt Ampere and Watt figures are needed for sizing a proper UPS.
VA rating is easily calculated by multiplying Mains (Line) voltage by total consumer's current, generally presented on each consumer's label.
The Wattage rating is not always displayed on consumer labels or associated documents. In such case, it should be measured by a Watt meter, or obtained from the consumer's supplier.
An alternative approach is to assume that the load has a unity power factor and look for a UPS that has a wattage rating, which is equal to the calculated VA rating. This attitude, although more expensive, might be the best approach as it covers also the possibility of future server replacement, which will probably have unity PF rating.
Both UPS's VA and Watt ratings should exceed the respective load ratings with a reasonable safety margin. Unfortunately we may confront new hurdle when looking for a proper UPS. Frequently, only UPS's VAfigures are provided by sellers or on manufacturer's sales information. The Specific UPS technical specifications should be consulted to get the relevant Wattage rating which the UPS supports.
Meir Portnoy is VP of UPSonNet - a leading UPS and Power Protection information source since 2006, providing UPS theory, selection and implementation guidance.
A directory list of North American Rack Mounted UPS systems, which enables to see at a glance available UPS systems from main manufacturers, including VA and Watt ratings as well as technical information and links to system suppliers, is presented on UPSonNet website.
For more information visit: UPSonNet Product Directory
The Features of Secure Digital Memory Cards of Different Companies
Everyone in this modern world wants to use digital products. Digital products like Secure Digital memory card could offer efficient performance. Find here the best Secure Digital memory card that suits your device.
Secure Digital Memory Card is a recent, convenient, tiny and non-volatile device. In general, it is used as standard memory storage device with universal access to all Multi Media such as:
•Digital cameras
•Handheld computers
•PDAs
•Mobile phones
•GPS receivers
•Video game consoles
As of 2008, the secure digital memory card has standard card capacities ranging from 8 MB to 4 GB and the high capacity SDHC cards are ranged from 8 MB to 32 GB.
Many well-known companies have developed memory cards to meet the increasing demand in the market. The new models of SD cards from reputed companies practically are more versatile across all digital media. These mainly help to share data in different format through its hassle free and easy connectivity. Here are three good SD Memory Cards produced by famous companies:
•Transcend
This name is well known in the flash memory device industry. It has:
1. 2GB 150X Ultra High Speed Secure Digital Memory Card
Its special features include:
•Memory storage of 2 GB
•Dimensions of 24 x 32 x 2.1 mm
•Highest reading speed up to 22 MB per second
•Maximum writing speed up to 17 MB per second in case of PC platform
Moreover, what is exceptional about this flash card is its CPRM which is an acronym of the term "Copy Protection for Recorded Media". The switch functions to activate mechanical write protection. It comes along with SD card specification as well. The maximum of 10,000 removal or insertion cycles of this SD card is essential for durability. The data that has been stored in the card, however, can be accessed in Word Mode. This card also offers distinct bus width like x4 and x1. The needed power for effective operations is a voltage range between 2.7 to 3.6 volts.
2. 4GB Secure Digital Flash Memory Card
This is a better platform for storing and transferring digital contents between handheld devices. Measuring 32mm x 24mm x 2.1mm, this very small flash memory card can be carried anywhere you go and has standard speed deliverance. The SLC or single-level-cell NAND flash technology that is used with this Flash Memory card gives you hassle-free transfer and data storage experience. Since it is very tiny in size, the power consumption is less. Thus, it gives more battery life. It does not require any PC for any additional set up also. It is compatible with digital media such as digital camera, digital video camera, PDA and many more.
Other special features:
•Storage capacity of 4GB
•Weight of 2g
•Power consumption between 7V to 3.6V
•Limited lifetime warranty
Kingston 2gb SD Memory Card
This SD memory stick can carry multi media files in a tiny case that helps to support all format without PC. It can also speed up the sharing and transferring of files. Its compact size and storage capacity of 2GB, which is slightly larger than a postage stamp, can store large amount of data. Plus it provides good data reading and writing speeds. It is adaptable with the SD card reader for easy download or transfer of your files to your PC. It is as well protected with built in write protection switch to rule out accidental loss of data.
It is compatible on digital media such as:
•SD enabled devices
•Smart phones
•Digital cameras
•PDAs
•MP3 players
Also, it is used to share and transfer:
•Photos
•Music
•Documents
Other features:
•Available also in 1GB
•Standard SD card
•Dimensions of 24mm x 32mm x 2.1mm
•Power consumption of 3.3v
•Cryptographic security protection
•Lifetime warranty
Memory2Go 1GB SD card
It is highly equipped with necessary features to support vast array of multi-media data. The card has a tiny size of 24mm by 32mm by 2.1mm making it so convenient to handle. Hence this lets you move between different digital devices.
Additionally, the Memory2Go is more compatible with any SD enabled device. The memory capacity of 1 GB of this unit can load broad kind of digital files. It has reading and writing speeds of 5 MB/sec and 1.5 MB/sec. It is protected with built-in write-switch to prevent accidental data loss. It has a 5 year limited warranty too.
Main applications:
•MP3 players
•Digital Cameras
•Sat Navs
•Camcorders
•PDAs
•Mobile phones
•Notebooks
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Digital Volt Meter?
Where can I buy a kid friendly volt meter? It is going to be used for a science project.
Radio hack. See the link below. And don't forget that misuse of a meter can be deadly.
WK
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