Elenco Green Projects - Manual (Page 38)

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Project #50 Sources in Parallel
Project #49 Sources in Series
Build the circuit shown. Place the solar cell
(B7) in sunlight or close to an incandescent
lamp. Set the meter to the 5V setting, but
double the reading it shows, since a resistor in
the pivot stand converts the scale to 10V.
Push the press switch (S2). If the slide switch
(S5) is set to position B, then the meter shows
the combined battery (B4) and solar cell (B7)
voltage. If it is set to position C, then the meter
shows only the solar cell voltage.
Vary the light on the solar cell and see how
the voltage changes.
The voltage produced
will be lower when these
sources are running
something that needs
lots of current, because
the solar cell can only
produce a small amount
of current.
5V
5V
Build the circuit shown. Place the solar cell
(B7) in sunlight or close to an incandescent
lamp. Set the meter to the 5V setting, but
double the reading it shows, since a resistor in
the pivot stand converts the scale to 10V. If the
slide switch (S5) is set to position B, then the
meter shows the battery (B4) voltage. If it is
set to position C, then the meter shows the
solar cell (B7) voltage.
If you push the press switch (S2), then the
battery and solar cell are connected in parallel
with each other, and the meter shows the
resulting voltage. Vary the light on the solar
cell and see how the total voltage changes.
See projects 1 & 3 if you need to recharge the battery (B4).