5º NATURALES - ESQUEMAS UNIDAD 6

All the substances are formed by molecules and atoms. At the centre of the atom is the nucleus = protons (positive charge) + neutrons (no charge)

Electrons (negative charge) are running around the nucleus

All objects need to be neutrally charged (same number of electrons and protons) for that reason protons attract electrons.

If we want to put together electrons and electrons or protons and protons, they repeal, like magnets!

No hace falta que copiéis este dibujo. Nos explica porqué hay rayos en las tormentas: la electricidad viaja de una nube cargada positivamente hacia otra cargada negativamente.

Electric current means electrons running through a path (un camino). The path needs to be a conductor: copper, silver or aluminium.

The power source is the red +

The conductor is the wire, the line that makes the rectangle

The switch is the moving part that opens or closes the circuit

The load is the bulb

ELECTRICITY AND INVENTIONS

You should learn at least (al menos os debéis saber) Los años no es necesario pero sí orientativo

1800: electrical battery Alessandro Volta

1876: telephone. Alexander Graham Bell

1879: Thomas Eddison. The light bult

1894: Guglielmo Marconi, the wireless telegraph

1925: Logie Baird, mechanical television

1973: the mobile phone