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Answered by anil kumar , an ibibo Citizen, at 4:05 PM on April 16, 2008

The power adapter box does several things. It lowers the voltage from the wall's 120 volts AC to typically 19 volts DC (it will be labeled with the exact voltage). It includes some power noise filtering. It often includes an automatic circuit breaker or overload detection. If this gets tripped, you can generally reset it if you unplug it from everything for a few minutes.

The most common type of AC power adapter involves a small box, with one wire to go to the computer and another wire to go to the wall. There is usually an LED light on it, to tell you that it is on. (Is it lit on yours?) By the way, Apple notebook power adapters often have an LED that is actually built into the side of the computer, not into the adapter box, so obviously it won't light up when it's not connected to the computer.

Batteries, given their chemical nature, are prone to wear, corrosion, leakage and outright failure due to events like short circuits and LIGHTINING STRIKES. Given their propensity to fail and to have decreased performance over time, it is important to be able to identify and monitor their performance. With BatteryMon, monitoring the state of your battery has never been easier. BatteryMon is an easy to use Windows program that allows the monitoring of laptop computer batteries and uninterruptible power supplies (UPS). Graphically see the battery charge / discharge rate, diagnose problem battery cells, compare your batteries performance with expected discharge rates and see the status of each individual battery pack (when multiple batteries are in use).

For those of you with circular connectors, your task is easy. Measure the voltage between the inside and the outside. A diagram on the adapter's label will tell you which should be positive and negative

Answered by shepherd , an ibibo Master, at 9:17 AM on April 16, 2008

Hi sparsha,

The most common type of AC power adapter involves a small box, with one wire to go to the computer and another wire to go to the wall. There is usually an LED light on it, to tell you that it is on. (Is it lit on yours?) By the way, Apple notebook power adapters often have an LED that is actually built into the side of the computer, not into the adapter box, so obviously it won't light up when it's not connected to the computer.

The power adapter box does several things. It lowers the voltage from the wall's 120 volts AC to typically 19 volts DC (it will be labeled with the exact voltage). It includes some power noise filtering. It often includes an automatic circuit breaker or overload detection. If this gets tripped, you can generally reset it if you unplug it from everything for a few minutes.

You can measure the voltages on your AC adapter with a multimeter. When it is unplugged from the computer but still plugged in to the wall, it is normal to find that the voltage may be 1 to 3 volts higher than the printed output rating. AC Power adapter LED is off when you plug the adapter into the wall but not into the computer

Has it been overloaded? Is the power strip turned on / is the outlet working? Is the cord from the adapter to the wall fully plugged in on both ends (try wiggling)? Your adapter may be fried- try borrowing an indentical adapter from a friend and seeing if that one will work in it's place (but do not plug it in to your computer, or you might fry your friend's adapter). Check output voltages with a volt meter/multimeter

For those of you with circular connectors, your task is easy. Measure the voltage between the inside and the outside. A diagram on the adapter's label will tell you which should be positive and negative

For those of you with the 3-pin Dell power connectors, I don't have a diagram for you yet, sorry. If you try measuring each of the three possible pairs of pins, you should get 20 volts between one of the pairs.
I think u understand what I said.

Answered by Nz , an ibibo Master, at 1:55 AM on April 16, 2008

Not at all. You are electrically isolated from any external connection. Air in any case is not a very good conductor or electricity.

Answered by Lucky Arora , an ibibo Citizen, at 12:41 AM on April 16, 2008

Batteries, given their chemical nature, are prone to wear, corrosion, leakage and outright failure due to events like short circuits and LIGHTINING STRIKES. Given their propensity to fail and to have decreased performance over time, it is important to be able to identify and monitor their performance. With BatteryMon, monitoring the state of your battery has never been easier. BatteryMon is an easy to use Windows program that allows the monitoring of laptop computer batteries and uninterruptible power supplies (UPS). Graphically see the battery charge / discharge rate, diagnose problem battery cells, compare your batteries performance with expected discharge rates and see the status of each individual battery pack (when multiple batteries are in use).

If there is a lightning strike to the cell antenna tower, energy comes directly into the inputs of connected products. There also is a possibility that the energy of a strike anywhere on that tower could cause a surge into the power supply to the unit, perticularly when the flow is WIFI.

Answered by keshto , an ibibo Master, at 11:16 PM on April 15, 2008