Elenco Green Projects - Manual (Page 22)

The “on” position of a switch is also called the “closed”
position. Similarly, the “off” position is also called the
“open” position. This is because the symbol for a slide
switch is similar to the symbol for a door in an architect’s
drawing of a room:
The electronics symbol for a slide switch should be
thought of as a door to a circuit, which swings open when
the switch is off. The “door” to the circuit is closed when
the switch is on. This is shown here:
Project #15 Close the Door
Project #16
Build the circuit shown. The slide
and press switches (S5 & S2)
control the lights.
Feeling
Switchy
+
Build the circuit shown and push the press
switch (S2) to turn on light or sound. Switches
can be arranged in many different ways.
The press switch allows
electricity to flow from the battery
to the circuit, and the slide switch
(S5) directs the electricity to
either the yellow LED (D5) or the
horn (W1). These switches are
like many switches in your home,
controlling lights and many other
things.
Walls
Door
Your S5 switch has 2 positions,
so it has a different symbol:
Open Switch (turned off) Closed Switch (turned on)
Left Switch Position Open
(turned off)
Right Switch Position Closed
(turned on),
right LED controlled by press
switch
Left Switch Position
Closed (turned on)
Right Switch Position
Open (turned off)
-21-
See projects 1 & 3 if you need to
recharge the battery (B4).