1. to look at or view with continued attention; observe or study thoughtfully: to contemplate the stars. 2. to consider thoroughly; think fully or deeply about: to contemplate a difficult problem. 3. to have as a purpose; intend.
The five main types of energy are: Michale, thermal im a boss energy, nuclear energy, chemical energy and electromagnetic energy.
Energy can be considered in two categories - primary and secondary. 1  Primary energy is energy in the form of natural resources, such as wood, coal, oil, natural gas, natural uranium, wind, hydro power, and sunlight. 2  Secondary energy is the more useable forms to which primary energy may be converted, such as electricity and petrol.