1. ENERGY

  1. ENERGY

Muscular energy was the only source of energy that people had. Then different mechanisms and machines were invented to make everyday tasks easier and improve people's quality of life.

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

1.1 Forms of energy.

Potential: Associated with the height of an object above the ground, or the storage of energy in a spring.
Kinetic: The energy of physial movement.
Mechanical: The sum of potential and kinetic nergy.
Sound: The energy of sound waves, which are produced by vibrations and propagated through a physical medium.
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: Results from the formation or descomposition of substance.
Electromagnetic: Occurs when electrical currents create magnetic fields.

1.2. Units of measurement for energy.

In the International System (IS), energy is measured in joules (J). When energy takes the form of heat, we often express it as calories (cal).

1.3. Power.

Power (P) is a measurement of how quickly work is done.
The power of a machine is the amount of work that it can do in a certain amount of time. We express this relationship as: P=W/t

Energy conversion efficiency (%) = Output/input x 100