1 This is a circuit which consists of a pusher, a buzzer and an electric battery. 2 This is a very simple circuit which consists of a switch, three light bulbs and an electric battery. 3 This circuit can´t work because it isn´t fully conected. 4 This circuit didn´t work because the fuse has broken due to the overtension. 5 This circuit works although the fact of having a fuse. 6 This is a very complex circuit with light bulbs, switches, a buzzer, a cell and an electric battery. 7 This simple circuit has a buzzer.
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