Thermodynamics: convection transfers heat through moving currents in fluids gasses or liquids Convection cannot occur in solids, because solids cant move. Radiation transfers heat through electromagnetic radiation and requires no molecular contact. Radiation can occur even in a vacuum.
Types of Energy-
There are many times of energy. All of them can create forces and motion. Often there are multiple types of energy present. Energy can be converted from one type to another. A few types are radiant energy, mechanical energy, and nuclear energy.
Law of coservation of energy: Ebefor = Eafter
"Energy is never created nor destroyed, just transformed into other forms of energy"
Conservation of engery means that all the energy is saved/retained. All the energy before an energy transformation must equal all of the energy afterwards.