Elenco Green Projects - Manual (Page 19)

Project #11 Battery Power
Project #10 Multi Power
Build the circuit shown. Set the
meter to the 5V setting. The
meter measures the voltage
produced by the windmill, solar
cell, and hand crank, which are
connected to work together.
You can change the meter setting
to 50mA, to measure the current
produced.
The red and yellow
LEDs (D1 & D5) are
used here to keep the
different power sources
from interfering with
each other, by
controlling the direction
electricity flows.
5V
Make sure the battery is charged up (see projects 1-3).
Build the circuit with the motor and fan on the pivot stand,
and connect the jumper wires as shown. Set the slide
switch (S5) to position B to turn on the circuit. The battery
runs the clock display (T2), horn (W1), red LED (D1), and
windmill (M4). Push the press switch (S2) and the hand
crank (HC) will also spin.
Part B: Set the slide switch to position C to disconnect
the battery, and blow on the fan or place it in a strong
wind. See if your “windmill” will run things as well as the
battery, and for how long.
Part C: Leave the slide switch at position C and push the
press switch while turning the hand crank to see how well
it runs things. Try cranking it in both directions.
The battery can store
lots of energy, so it
can run lots of things
for a while. It is
available whenever
you need it, at the flip
of a switch.
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See projects 1 & 3
if you need to
recharge the
battery (B4).
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