Sources of energy notes science||Cbse notes class-10th science
Source of Energy Notes •Energy comes in different forms and one form can be converted into another. •A source of energy is one which provide adequate amount of energy in a convenient form over a long period of time. Need of energy: • For making Food. • For lightening . • For transport . • For running machines. • For industrial activities and agricultural work. Qualities of a Good Source of energy 1. which would do a large amount of work per unit mass. 2. Cheap and easily available. 3. Easy to store and transport. 4. Safe to handle and use. 5. Does not cause environmental pollution. Fuels: The materials which are burn to produce heat energy are known as Fuels E.g wood, cool, LPG, Kerosence. Characteristics of a good fuel • High calorific value (give more heat per unit mass). • Burn without giving out any smoke or harmful gases. • Proper ignition temperature • cheap and easily available • Easy to handle , safe to transport. • Convenient to store. • Burn smoothly. Sourc