How to get FREE Standard Shipping: Ship to an address within the United States (including U.S. territories) Place your online order of $25 or more* - after promotions and before tax are applied. Use Standard shipping option at checkout.
alternative energy-energy derived from sources that do not use up natural resources or harm the environment. energy, free energy - (physics) a thermodynamic quantity equivalent to the capacity of a physical system to do work; the units of energy are joules or ergs; energy can take a wide variety of forms.
Electric energy is then converted to useful mechanical energy by motors. And mechanical energy is converted to electrical energy by electric generators. The Energy Story is a good website that describes what energy is. How energy and work are related.nergy Conversion. Definition: The process of changing one form of energy into another. For example, the chemical energy in gasoline can be converted into kinetic energy (energy of motion) by an automobile engine. Definition obtained from the K - 12 Energy Education Program (KEEP).