Ever wondered why people with tooth fillings 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 actually a minor electric current tantalizing the nerves underneath the tooth.  Electricity has been by far, one of the most important and novel discoveries to mankind. With population getting increasingly mobile, they have gravitated more towards portable solutions of electricity, which manifests itself in the form of Batteries.