Primary energy resources: raw materials used for power in their natural form e.g coal/oil/ wood/uranium. can be converted to secondary energy . industrialised contries need continuous supply of energy for survial, LEDCs rely more on wood, peat and animal waste.
Demand and consumption of energy has grown over the last 200 years:
Rapid population growth, last 50 years in less developed contries.
Economic development and wealth, middle class society, more wealth more personal mobility and demand for goods.
Technological change, first the development of the stream engine, fueld by caol during industrial revolution in 19th century. 20th century demand for oil outstripped coal due to combustion and jet engines being developed.
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