E N E R G Y

From of energy Energy has many interchangeable forms viz. Heat Light Mechanical power electricity

NATURE OF ENERGY SOURCES Some sources like fossil fuels on which the present they world depends the most are exhaustible. Similar are nuclear and energy . Some sources are renewable-they rebirth everyday . Solar wind wave .

DEVELOMENT VS CONSUMPTION Development is direct to the of energy. The more you are more is the energy . World primary energy demand. 1972 :270 ej (1018 j) 1985:390 ej 2000:590 ej 2020:840 ej

SOURCES OF ENERGY There are many sours of energy Fossil fuels coal, oil and Nature gas Biomass Energy ,energy from plants Hydro power Nuclear power

Energy consumption Cave Man (10,00,000)years ago 3kWh Hunting man (1,00,000 years ago) 7kwh Agricultural man (5000BC) 13kwh Industrial man (20th century) 260kwh advanced Technically man (21stcentury) 410kwh++