1 Energy and Heat Transfer

2 What Is Energy? Definition—The ability to do work. Types of energyMechanical Chemical Electrical Radiant Nuclear A Energy

3 Mechanical Energy What makes a machine to perform work.Examples include: Hand mixers Water wheel Flour mill A Energy

4 Chemical Energy As bonds break or form between atoms, chemical energy is generated. Examples include: Using ice and salt to make ice cream. Digestion of foods. A Energy

5 Electrical Energy Movement of electronsTransported through wires to where needed. Easily changed to heat or mechanical energy. Examples include: Electrical home appliances – stove, refrigerator, dishwasher A Energy

6 Radiant Energy Energy transmitted in the form of waves through space or some medium. Examples: Microwave oven Sun Charcoal grills Gas flames A Energy

7 Nuclear Energy Splitting or combining atoms of certain elements which give off radiation. Examples: X-rays in medicine Nuclear power Irradiation – food preservation A Energy

8 What Is Heat? Definition—An energy transfer from one body to another caused by a temperature difference between the two bodies. A Energy

9 Three Ways Heat is TransferredConduction Convection Radiation A Energy

10 Conduction Heat (or energy) is transferred by molecular collisions.Example: Cooking foods in an oven. A Energy

11 Convection Heat (energy) is transferred through molecular collisions and and currents. Heat (energy) is more rapid than conduction. Example: Food cooked in boiling water. A Energy

12 Radiation Heat (energy) is transferred by light waves through space.Examples: Sunlight Microwave A Energy