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Defination:-Ever wondered why people with tooth fil ings sometimes
complain of getting an electric shock like sensation while they nibble on to
chocolates from the foil coating or from the silver on desserts? It is not just
a fleeting sensation, but is actual y a minor electric current tantalizing the
nerves underneath the tooth. A momentary cel is formed between the foil
and the amalgam of the tooth fil ing with the acidic saliva acting like the
transport medium, the electrolyte.
Nickel Cadmium (NiCd) Batteries:-Nickel Cadmium (NiCd) Batteries have
a matured technology and are used in places where long service life and
economy amidst difficult environmental conditions is required. An easy
alternative to this chemistry is the relatively environment friendly Nickel
Metal Hydride (NiMH) technology which has improved specific energy
ratings. Faster charging and long shelf life coupled with economical pricing
and availability in various sizes make them an attractive option for smal
consumer products. However they seem to suffer from Memory effects
hence needing periodic ful discharges and also suffer from high self
discharge.
The NiMH battery is similar to NiCd cel s in structure but it uses a hydrogen
absorbing al oy as negative electrode instead of cadmium. The positive
electrode is a nickel oxy hydroxide (NiOOH).Alkaline batteries have
approximately 3000 mAh capacity with a 1000 mA load. Digital camera with
LCD and flash light can draw over 1000 mA quickly and depleting the
alkaline batteries after a few shots. NiMH batteries on the other hand can
easily handle the high current levels and maintain their ful capacity.
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