1. Most of our energy is originally derived from the sun.
2. Environmental impacts differ depending upon the energy source and conversion
process.
3. Energy sources can be classified as renewable, nonrenewable or inexhaustible
resources. Currently, society is strongly dependent upon nonrenewable energy
resources.
4. An energy source can be considered renewable if it is replenished within a short
period of time.
5. The world’s supply of nonrenewable resources is limited and their use can
negatively affect our environment.
6. Different energy sources have different costs.
7. A system is made up of a sequence of conversions.
8. In the conversion of energy a significant fraction of that energy ca