Elenco Snaptricity&reg - Manual (Page 50)

Snappy says: Engineers refer to this
switching combination as an AND
sub-circuit (short for “this AND that”).
It even has its own symbol.
-49-
And Project #40
Educational Corner:
Having to turn on a lot of switches just to turn on a lamp seems
simple but is very important. The press switch could represent
an on/off switch on an electric saw, one of the slide switches
could be a safety switch on the saw, and the other slide switch
could be a fuse box in your basement. Safety is very important
in electrical wiring.
AND circuits are used in home security systems, where contacts
across windows and doors are wired together in a series circuit
like this one. Opening any door or window breaks the circuit and
triggers an alarm.
Use the switches (S2, S5) to turn on the lamp (L4).
Operation
The lamp will only light if there is a complete (“closed”)
circuit. This means that the left
AND right slide switches (S5)
have to be on (position C). The press switch (S2) must be
on (pushed).
Description
Build the circuit shown.
Assembly
Electric Paths
AND Gate