INTELLECTUAL OUTPUT 2 English version | Page 222

http://www.bbc.co.uk/schools/scienceclips/ages/10_11/changing_circuits_whatnext.shtml.
Quiz
http://www.petervaldivia.com/electricity/
http://www.bbc.co.uk/bitesize/ks2/science/physical_processes/electrical_circuits/read/1/
http://www.allaboutcircuits.com/textbook/direct-current/chpt-1/electric-circuits/