ENERGY
GROUPS OF ENERGY, SOURCES:
Definition: ENERGY is the ability to do a job.
FORMS OF ENERGY: 1.- MECHANICAL: POTENTIAL + KINETIC Depending on Depending on the position. the movement.
LIGHT TYPES OF LIGHT SOURCES: .- NATURAL SOURCES: (The Sun, stars…) .- ARTIFICIAL SOURCES: (light bulb, candle…)
2.- CHEMICAL: Transformation of substances, releasing light, heat…
PROPAGATION OF LIGHT:
3.- THERMAL: Vibrations of atoms produce heat.
Light travels: 1.- STRAIGHT. 2.- ALL DIRECTIONS. 3.- VERY FAST (300,000 km/s)
4.- NUCLEAR: Reactions inside atoms of uranium, plutonium…
LIGHT AND MATTER:
5.- ELECTRICAL: Flow of electrons through a conductor. 6.- LIGHT: Light is a kind of radiation from light sources. 7.- SOUND: Sound is an energy made of vibrations
Three groups of substances: 1.- TRANSPARENT. 2.- TRANSLUCENT. 3.- OPAQUE.
PROPERTIES OF LIGHT: 1.- REFLEXION (Mirrors) 2.- REFRACTION (Lens) 3.- COLOURS: .- red .- orange .- yellow .- green .- blue .- indigo .-violet
NON-RENEWABLE .- COAL .- PETROLEUM .- NATURAL GAS .- NUCLEAR POWER
RENEWABLE .- SOLAR .- WIND .- HYDROPOWER .- BIOMASS .- GEOTHERMAL
SOUND PROPAGATION OF SOUND: Sound travels: 1.- ALL DIRECTIONS. 2.- FAST (340 m/s) 3.- NEVER THROUGH VACUUM
CHARACTERISTICS OF SOUND: 1.- INTENSITY (Volume) ( LOUD / QUIET) 2.- PITCH: (HIGH / LOW) 3.- QUALITY or TIMBRE 4.- DURATION: (SHORT / LONG)