Introduction Refractories are materials which can withstand very high temperatures. They are quite hard and chemically stable. Thus, refractories are materials which are used for the construction of furnaces, kilns, ovens...
Tag - Chemistry
Fuel cells A fuel cell is an electrochemical cell, which can convert the chemical energy of the fuel into electrical energy. It is an energy conversion device or electricity generator. A fuel cell operates like a galvanic cell...
SYNTHETIC ABRASIVEs (i)Silicon carbide (SiC) or Carborundum Manufacture: Silicon carbide is manufactured by heating together a mixture of 52%-54% of sand (SiO2) + 35% of Coke (C) + 7%-11% of sawdust + 1.5%-4% of Salt, in an...
ABRASIVES Abrasives play a commendable role in our daily life and industry. For example, a house wife uses an abrasive stone to keep her kitchen knives sharp, a dentist uses an abrasive powder when he cleans his teeth and tiny...
A nickel – cadmium battery is a type of alkaline storage battery. This is also a rechargeable battery. In a Ni – Cad cell, the anode is a cadmium electrode and the cathode is nickel oxide (NiO2). The electrolyte...
Lead acid battery was invented by Gaston Plante in 1859. A lead acid storage cell is an electrochemical cell, which stores electric charge. This acts as a voltaic cell and as an electrolytic cell. On supplying electrical...
Alkaline battery is an improved from of the dry cell. It is introduced in 1949. In this cell, NH4Cl is replaced by KOH as the electrolyte. As the electrolyte in this cell is an alkali, it is called alkaline battery. Anode :...
Batteries are classified into three categories depending upon their recharging capacities: 1. Primary battery or primary cells These are non-rechargeable. Hence, non-reversible. It is meant for a single use and to be discharged...
Energy generated from the force of the wind is called wind energy. Wind is a form of fast moving air. The wind has a lot of energy because of its high speed. Important applications of wind energy Wind mill: It is a simple machine...
Solar cells or photovoltaic cells are devices that converts solar energy directly into electrical energy. Basic principle of solar cell When solar rays falls on the two surface layers of semiconductor devices, a potential...
