Elenco Green Projects - Manual (Page 69)

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Project #112 Sun & Wind Light
Regulating Power
Build the circuit and push the
press switch (S2). Use the
slide switch (S5) to adjust
the red LED (D1) brightness.
Replace the red LED with
the yellow LED (D5) or the
motor (M4) and use the slide
switch to adjust it for
brightness or speed.
The meter shows that the
current is lower when the
LED/motor is set for lower
brightness/speed.
Build the circuit shown, with the motor
mounted on the pivot stand like a
windmill. Use either sunlight or wind
power to run the red LED (D1). Select
the one that is available using the slide
switch (S5).
During the day, the sun powers the LED
using the solar cell. At night, the wind
powers the LED. This circuit does not
consume any fuel, and causes no
pollution.
Project #111
Here the slide switch adds resistance to
reduce the current used, saving energy.
In your home you should always run lights
and motors at the lowest brightness or
speed needed for what you are doing. This
reduces the need for electricity, which
saves you money and reduces pollution. 50mA
+
See projects 1 & 3 if you need to recharge the battery (B4).