Types of Energy

1.Chemical

potential or kinetic

in atoms

electrons (-) negative charge

protons (+) positive charge

neutrons no charge

charges create chemical energy

in our bodiescontained in atoms -proteins and

chemicalsfood converted into energy -metabolismexhale heat energy

measured in calories (kilocalories)

Kcal = the amount of heat required to raise 1 kilogram of water 10 C

we burn this as energy

in chemicalsgasolineacidsbase

2. Heat Energy –thermal potential and kinetic burning coal or oil steam turns a turbine energy that is produced or is a result of a

chemical reaction

3. Radiant energy

potential or kinetic

SUN -through chemical reactions on the

sun

transferred to the earth through the atmosphere

radio waves, visible light, ultraviolet light

4. Mechanical energy

potential or kinetic

machines

makes work easier for us -mechanical

advantage

5. Electrical energy -wire

potential or kinetic energy

electrons move

uses a magnetic field

turns motors, powers all of our electrical equipment

activates electrical activity in storms

-lightning, static, electrical

6. Sound energyvibrationswaves of pressurein air or water

7. Nuclear energypotential or kineticatoms change

-split –fission, combine –fusionheat, light, explosions

Energy in a System

• A system is a set of objects working together to accomplish a job

• The amount of energy within a system remains constant. It only changes forms

• Example a person creating heat with sticks

System

The person contains chemical energy.

Let's say 50 Joules of chemical energy

Friction uses up 20 Joules of the beginning energy

Th heat is given off equals 30 Joules of energy

30 + 20 = 50 the total amount of energy remains constant and only changed forms