Elenco Green Projects - Manual (Page 14)

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Project #2
Build the circuit shown by placing all the parts with
a black 1 next to them on the clear plastic base grid
first. Then, assemble parts marked with a 2, and
finally the parts marked with a 3. Be sure to place
the parts with their (+) side oriented as shown.
Place the wind fan on the motor (M4) shaft. Turn the
handle on the hand crank (HC) in both directions to
make things happen.
Warning: the hand crank is sturdy but not
indestructible. If you push hard on it or crank it really
fast you may break it.
Hand Cranking
The hand crank uses
magnetism to change
the mechanical energy
of the spinning shaft
into electricity.
+
+
Placement Level
Numbers
Project #1 Crank Charger
Build the circuit shown here and set the meter
(M6) to the 5V setting. The meter will measure
about 3.6V if the battery is charged up.
Turn the hand crank (HC) clockwise. The
yellow LED (D5) comes on when you crank
fast, indicating that the crank is charging the
battery.
If the battery needs to be recharged, you can
use this circuit to charge it.
Although the battery is rated as 3.6V, it may charge to as high as 4.0V. If you
are monitoring the voltage using the meter, you may see the voltage quickly
reach 3.6V, but this does not mean that the battery is fully charged. When
the battery is discharging to power something, the voltage is nearly steady
for a long while then drops off quickly. The same thing occurs when it is
charging. Recharging the battery will quickly reach around 3.6V but it needs
much more charging to avoid a quick drop-off when discharging.
5V