1.Energy

Energy is the capacity of a body to perform transformations and do work



-Form of enery                                         - Description

Potential                                    Associated with the height of an object above the grand.

Kinetic                                     The energy of physical movement

Mechanical                              The sum of potential and kinetic energy

Sound                                      The energy of sond waves,which are produced by vibrations

Electrical                                 The product of an electrical current

Nuclear                                   The energy in the nucleus of an atom

Luminous                                Associated with light

Thermal or Calorific              Associated with the movement of particles in matter

Chemical                                Result from the formation or descomposition of substances

Electromagnetic                     Occurs when electrical

1.2Units of measurement for energy

In the IS,energy is measured in joules(J).When energy takes the form of heat,we often express it as calories(cal).
The relationship between calories and joules is:1 cal=4.18 J.

1.3.Power

The power of a machine is the amount of work that it cando in a certain amount of time.P=W/t.