SCIENCEUNIT 8

ENERGY

• EnergyEnergy is everything that produces changes in things. There are different forms:• Light.• Heat.• Mechanical.• Electrical.• Chemical• Nuclear.A transformation of energy is when one form of energy changes into another.

• Energy sourcesEnergy sources are the natural resources from which we obtain the energy we use. They can be non-renewable or renewable.We exhaust non-renewable energy sources because they do not have time to renew themselves. The main ones are fossil, fuels and radioactive substances.We cannot exhaust renewable energy sources because they renew themselves continually. Some examples are the Sun, wind, moving water and biomass.

Forms of energy

Mechanical energy Electrical energy

Chemical energy

Energy sourcesRenewable natural resources

Wind turbines

Hydro-electric power station

Solar panels

Renewable natural resources

Power stations Nuclear power stations Coal

Lesson vocabularyEnergy: energíaThings: cosasLight: luzMechanical: mecánicaChemical: químicaTo change: cambiarEnergy sources: fuentes de energíaNatural resources: recursos naturalesTo use: utilizarNon-renewable: no renovableRenewable: renovableFuel: combustibleWind: vientoPower station: central electricaHydro-electric power station: central hidroeléctricaSolar panels: panel solarBiomass: biomas.To exhaust: agotarThemselves: ellos mismos