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.
Food, biomass, fuel and explosives have a store of chemical energy. The energy from food is released by chemical reactions in our bodies in the form of heat. Fuels like coal, oil and natural gas contain chemical energy that may be converted into other forms of energy like heat and light.n this lesson, we are going to look at the forms that energy exists, namely: heat, light, sound, electrical, chemical, nuclear and mechanical. These forms of energy may be transformed from one form to the other, usually with losses.