Conduction- In heat, energy transfer from particle to particle within materials, or from one material to another when the two are in direct contact. (b) In electricity , the flow of charge through a conductor.
Convection- A means of heat transfer by movement of the heated substance itself, suck as by currents in a fluid.
Radiation- Energy transmitted by electromagnetic waves. the particles given off by radioactive atoms such as uranium.
Joules- The SI unit of work and of all other forms of energy. One joule (symbol) of work is done when the force of newton is exerted on an object moved one meter in the direction of the force.
Calories- A unit of heat. One calorie (symbol cal.) is the heat required to raise the temperature of one gram of water one Celsius degree. One Calorie (with a capital C) is equal to one thousand calories and is the unit used in describing the energy available from food. ( 1 cal.=4.184 J, or 1 J=0.24 cal.)
1st law of thermodynamics- Heated added to a system is transformed to an equal amount of some other form of energy; a version of the law of energy conservation.