বিজ্ঞান-বিচিত্রা | Biggyan-bichitra

1. ( v ) Effects of electric current: magnetic, heating, chemi- cal; Electric bell. Idea of intensity (like flow of water per unit ime : some thing pushed). Idea of resistance (compare flow of water through pipe; pipe offers resistance to flow). Interaction of electricity and magnetism. Electromagnetic induction (Faraday). Daniel Cell, Leclanche Cell and Lead. accu- mulators ; (No explanation of chemical reaction required). Electricity as energy; Motors, Heating and lighting ; Electric lamps. Electricity for communica- tion : telegraph, telephone. C. METALS Study of the natural occurrence and properties and uses of the following metals and alloys: iron, copper, aluminium, zinc, steel, brass, bell-metal. (Details of methods of extraction not required). Construction of electro- magnet, assembling an electric bell ; electrolysis. Simple experiments to show action of magnet on current and current on magnet. Experiments ০07 electro- magnetic induction. Handling of Daniel cell and Leclanche cell (dry and wet) and lead accumulator. Working models; handling an electric iron, stove and heater; study of a fan regulator. Model of telegraph.