Energy

1
Energy

• Conservation of Energy
• Thermal Energy

2
Energy

• There are a many forms of energy

Elastic Energy Energy in an object from its compression or stretching Elastic band
Electric The movement of electrons from 1 atom to another Batteries
Thermal Disorganized movement of particles in any substance Fire
Chemical Stored in the bonds of molecules Combustibles
Wave Contained in a electromagnetic wave Radio
Hydraulic Transported in the flow of water Waterfall
Nuclear Energy stored in the center (nucleus) of an atom Sun
3
Energy

• Energy is defined as the capacity to do work of
  certain force
• There are 2 types of energy
• Potential (stored)
• Kinetic (working)
• Stored in different ways
• Renewable (solar, wind, geothermal)
• Nonrenewable (oil, fossil, coal)

4
Units

• Energy is expressed in Joules
• 1 J 1 N x 1 m

5
Law of Conservation of Energy

• Energy may neither be created or destroyed, the
  total energy of a system remains constant
• Transfer energy from 1 place to another
• Transform energy in 1 form to another form

6
Energy Efficiency

• Energy efficiency is the percentage of energy
  consumed by a machine or system that was
  transformed into useful energy.

7
Energy Output

• No energy is lost, but it can go unused
• Therefore
• Net Energy Energy(Output) Energy(Input)
• Efficiency Amount of useful energy x 100
• Amount of energy consumed

8
Thermal Energy

• Disorganized movement of particles in a given
  substance
• Depends on the quantity of particles and the
  temperature of the substance

9
Quantity of Particles Particles Increase Particles Decrease Thermal Energy Increases Thermal Energy Decrease
Temperature Temperature Increase Temperature Decrease Thermal Energy Increases Thermal Energy Decrease
10
Heat

• Heat the transfer of thermal energy between two
  areas of different temperatures
• Heat always passes from higher to lower