1. E N E R G Y

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

3. 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 .

4. 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

5. 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

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