1. Energy Review

2. Energy
A property of objects which can be transferred to other objects or converted into different forms, but cannot be created or destroyed
“Ability of a system to perform work“
Measured in joules
a distance of 1 meter against a force of 1 newton
1 J = 1 Nm

3. Kinetic vs Potential Energy
Kinetic Energy
Potential Energy
The energy that it possesses due to its motion
KE = (1/2)mv^2
m = mass
v = velocity
The energy that an object has due to its position
PE = mgh
m = mass
g = Earth’s gravitational constant = 9.8 m/s
h = height

4. Forms of Energy Chemical Energy Electrical Energy Radiant Energy
Mechanical Energy
Thermal (heat) Energy
Sound Energy
Solar Energy
Nuclear Energy

5. Energy Transformations
A change from one form of energy to another
Single Transformation
One form of energy is transformed into another
Ex. Toaster
Multiple Transformation
A series of energy transformations
Ex. Car engine

6. Law of Conservation of Energy
When one form of energy is transformed to another, no energy is destroyed in the process
In physics, the law of conservation of energy states that the total energy of an isolated system remains constant—it is said to be conserved over time. Energy can neither be created nor destroyed; rather, it transforms from one form to another.

7. Energy Transfer Diagrams

8. Energy Transfer Diagrams cont’d.
Sankey Diagrams

9. Common Energy Sources