mardi 15 septembre 2009

The battery cells

The battery cells create a voltage difference between the terminals of each cell and hence to its combination in battery. When an external electrical circuit is connected to the battery, then the battery drives electrons through the circuit and electrical work is done. Since the invention of the first Voltaic pile in 1800 by Alessandro Volta, the battery has become a common power source for many household and industrial applications, and is now a multi-billion dollar industry.
The name "battery" was coined by Benjamin Franklin for an arrangement of multiple Leyden jars (an early type of capacitor) after a battery of cannon.[1] Strictly, a battery is a collection of two or more cells, but in popular usage battery often refers to a single electrical cell.[2]
An early form of electrochemical battery called the Baghdad Battery may have been used in antiquity.[3] However, the modern development of batteries started with the Voltaic pile, invented by the Italian physicist Alessandro Volta in 1800.[4]
In 1780 the Italian anatomist and physiologist Luigi Galvani noticed that dissected frog's legs would twitch when struck by a spark from a Leyden jar, an external source of electricity.[5] In 1786 he noticed that twitching would occur during lightning storms.[6] After many years Galvani learned how to produce twitching without using any external source of electricity. In 1791 he published a report on "animal electricity."[7] He created an electric circuit consisting of the frog's leg (FL) and two different metals A and B, each metal touching the frog's leg and each other, thus producing the circuit A-FL-B-A-FL-B...etc. In modern terms, the frog's leg served as both the electrolyte and the sensor, and the metals served as electrodes. He noticed that even though the frog was dead, its legs would twitch when he touched them with the metals.
You probably don’t even think about it but do you know that your cell phone battery is the most important part of your wireless phone. Without the cellular phone battery, the cell phone does not work. We have put together a list care and information tips for our cell phone clients.
Cellular Battery Care:
Keep the cellular phone battery’s contacts clean.
Recharge the battery after periods of non-use to maximize the life of the battery.
Never take the cellular phone battery apart.
Never dispose of your cellular phone battery in fire or hazardous, flammable substances.
Dispose of your battery properly or take it to your wireless carrier for recycling.
Cellular Battery Information:
Cellular battery life will depend on use and environmental conditions.
Do not store your cell phone in temperatures greater than 122F degrees or less than –4F.
Never use an unapproved cellular phone battery as this could damage your cell phone or cause the battery to explode.
Only use approved cellular phone battery chargers specific to the cell phone model. These cell phone devices are designed to provide maximum cellular battery life.
Replace the cellular battery when it no longer provides acceptable performance.
You may be using your cellular phone for emergencies. It’s the device between you and help. So make sure you take care of cellular phone battery. Your life may depend on it.
Catherine Kenyeres is a free lance writer and publisher for Best-4u-Cell-Phones.com. Catherine provides the latest information, reviews and comparisons for cell phone clients.
Batteries are classified into two broad categories, each type with advantages and disadvantages.
• Primary batteries irreversibly (within limits of practicality) transform chemical energy to electrical energy. When the initial supply of reactants is exhausted, energy cannot be readily restored to the battery by electrical means
• Secondary batteries can be recharged; that is, they can have their chemical reactions reversed by supplying electrical energy to the cell, restoring their original composition.

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