Calculators by Steve Valentino
A calculator is a device that is used for performing numerical calculations. The first calculator was the abacus, which was constructed as a wooden frame with beads sliding on wires. Calculations were made by moving these beads up and down the wires. ... There is a power source, which may be either a battery or a solar panel; a display from LED lights; electronic circuitry; and a keypad comprising of the ten digits, the four arithmetic functions, the equal sign, the decimal point, on and off buttons, a cancel button and some other basic functions.

Your Guide to Battery Types by Chris Robertson
Every mobile electronic device we own runs on battery power, yet we take batteries for granted - at least until they run out of juice. No matter what kind of device battery - laptop battery, cell phone battery, camcorder battery, remote control battery - you need, it's helpful to know the... NiCd - NiCd stands for Nickel Cadmium, and is a type of rechargeable battery commonly used in toys, electronic devices, and power tools. ... SLA batteries are often used in wheelchairs, scooters, and uninterruptible power sources.

Power Surges - Disaster Caused And How To Avoid It by Dicky Satrio Sudiro
Power surge are one of the most feared incident on electronic devices. Same as computer, they are really susceptible to power surges. Even though surges usually last only milliseconds (and are somewhat filtered by the transformer in the power supply), that high voltage can exceed the withstand... Any number of events, from lightning strikes to power failures, can cause power surges. ... The internal transformers on power supply that do this, the capacitors to bridge over dips in the line power, all these are rated to handle a certain amount of energy at any given time.

UPS Power Supplies To Protect Your Computer by Alan LeStourgeon
Many people do not realize the absolute importance of purchasing a UPS power supply for their system. UPS stands for Uninterruptible Power Supply, but it is not uncommon to hear people refer to them as UPS power supplies, despite the redundancy. It can also be confusing to newcomers because... An uninterruptible power supply works by filtering the electrical power coming from electric company while storing a small amount in a battery. ... For a standalone desktop system with one printer, you'll want to buy a UPS that can give you at least ten minutes to shut down properly and save your...

What is X10 by Christian Rivard
X10 Cameras are becoming very popular for several reasons. But what is X10? X10 is a communications language that allows compatible products to talk to each other using the existing electrical wiring in the home. Most X10 compatible products are very affordable and the fact that they talk over... But because it is using the same power source of electronic appliances like cordless phone, computer, computer monitor, television, satellite, dryer, electric toothbrush it is important that you spend a few extra dollars on noise filters for these electronic devices.

Batteries - One Size Does Not Fit All by Dan Hagopian
I have a Palm Zire 72 and a Palm m505 PDA. If I buy a Palm Zire 72 Battery that is 3.7 volts can I plug it into a Palm m505 and have that battery power both devices as needed? In a nut shell the question above seeks to ascertain if all 3.7 volt batteries are the same? ... If you have a PDA, MP3, MP4, Laptop, Cell Phone, Smartphone, DVD players, or other electronic devices then more likely then not the battery within your device is a high capacity smart battery pack. ... A high capacity smart battery pack is a complex battery system designed to power high tech electronic devices.

The Future is Now for the NY Times by Zed Hayden
Reading the morning paper just got a 21st century upgrade. The New York Times is now among the first newspapers to release an E-Paper format to subscribers. Soon subscribers will be synchronizing the latest copy of the NY Times and many other major papers from around the world to e-reader... While a market for a new kind of electronic reading display remains to be seen, the new E-Reader devices promise to be different thanks to a unique approach in display technology. ... While it's not designed to be a quick refreshing display that would be used for a television, E-Ink displays are...

Three Must Have Accessories For Notebook Computers by Lynn Chan
An Optical Mouse Notebooks are normally equipped with touch pads which can be awkward. There's no substitute for the mouse. Notebooks are predominantly used on a static, flat surface. With wireless broadband hotspots mushrooming all over the nation's transit locations, table tops have become... A Multi-Device Charger And Power Adapter Combo Notebooks do come with their own AC-to-DC power adapters, but notebook owners typically carry a cell phone, PDA and digital camera in addition to the notebook.

Integrated Power Management Circuits by Dan Hagopian
Discussing internal battery design would be incomplete if we did not write on the subject of integrated circuits. Batteries for PDAs, MP3s, Digital Cameras, and Laptops have designed within them integrated power management circuits that insure that the deliverance of reliable power is properly... They perform critical functions including power-on-reset (POR) protection to ensure that processors always start at the same address during power-up. ... Without POR, even well-functioning systems can exhibit problems during power-up, power-down, overvoltage, and undervoltage conditions.

Do Computers Get Tired? by Bob Rankin
A Silver Bullet? Until recently, I would have dismissed the notion that electronic gunk can accumulate in a machine and cause it to act erratically. But a few months ago my high-speed Internet connection, which is normally rock solid, started getting flaky. ... There aren't many people alive who know more about how electronic gadgets (especially power supplies) are supposed to work. ... An SEU can be caused by a power glitch, or a cosmic ray passing through a integrated circuit, and can actually flip the logic state (from 1 to 0 or vice versa) of a circuit.