In brief, ârhetoricâ is any communication used to modify the perspectives of others. But this is a very broad definition that calls for more explanation. The OWLâs â Introduction to Rhetoric â vidcast explains more what rhetoric is and how rhetoric relates to writing. This vidcast defines rhetoric as âprimarily an awareness of the language choices we make.â It gives a brief history of the origins of rhetoric in ancient Greece.
The lawof conservation of energy says that energy is neithercreated nor destroyed. When we use energy, itdoesnât disappear. We change it from one form ofenergy into another.A car engine burns gasoline, converting the chemicalenergy in gasoline into mechanical energy. Solar cellschange radiant energy into electrical energy. Energychanges form, but the total amount of energy in theuniverse stays the same.
Combustion is the most common energy. Combustion is the energy of the sun. Combustion is a chemical reaction. Electrical energy is mostly man made, converted from another energy, like combustion of coal, or from a turning magnet, like at a hydroelectric dam. For combustion, you do require three things on earth: fuel, oxygen, and a spark.