Energy and Heat Transfer

What Is Energy? Definition—The ability to do work. Types of energy Mechanical Chemical Electrical Radiant Nuclear A 2.01 -- Energy

Mechanical Energy What makes a machine to perform work. Examples include: Hand mixers Water wheel Flour mill A 2.01 -- Energy

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 2.01 -- Energy

Electrical Energy Movement of electrons Transported through wires to where needed. Easily changed to heat or mechanical energy. Examples include: Electrical home appliances – stove, refrigerator, dishwasher A 2.01 -- Energy

Radiant Energy Energy transmitted in the form of waves through space or some medium. Examples: Microwave oven Sun Charcoal grills Gas flames A 2.01 -- Energy

Nuclear Energy Splitting or combining atoms of certain elements which give off radiation. Examples: X-rays in medicine Nuclear power Irradiation – food preservation A 2.01 -- Energy

What Is Heat? Definition— An energy transfer from one body to another caused by a temperature difference between the two bodies. A 2.01 -- Energy

Three Ways Heat is Transferred Conduction Convection Radiation A 2.01 -- Energy

Conduction Heat (or energy) is transferred by molecular collisions. Example: Cooking foods in an oven. A 2.01 -- Energy

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 2.01 -- Energy

Radiation Heat (energy) is transferred by light waves through space. Examples: Sunlight Microwave A 2.01 -- Energy