Electric charges and currents

Electricity is produced by the ____________________ of electric ____________________ through a ____________________ in a ____________________ circuit .

____________________ are made up of a nucleus and a shell . The ____________________ contains ____________________ and neutrons . In the shell , ____________________ orbit around the nucleus . Neutrons do not have an electric ____________________ . Protons have a ____________________ charge , whilst electrons have a ____________________ charge .

Forces of attraction and ____________________ are produced between electrical charges . ____________________ with the same sign ____________________ one another , while those with ____________________ sign attract one another .

There are ____________________ different types of electric currents . Direct current , which are produced by ____________________ and cells , where the electrons always move in the ____________________ direction . ____________________ currents , which reach our homes through the electricity ____________________ , where electrons ____________________ direction periodically .