Elenco Green Projects - Manual (Page 37)

50mA
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Project #48 Current Order
Build the circuit; it has the parts arranged in a loop. Place the wind fan
on the motor (M4). Set the meter (M6) to the 50mA setting. Set the slide
switch (S5) to position B. Place the solar cell (B7) in bright sunlight or
near an incandescent lamp. If the light is bright enough, the meter will
show a current, the LEDs (D1 & D5) will light, and the fan will spin. You
may need to give the fan a push to get it started. If the meter shows
zero, you can use the 0.5mA setting.
Part B: Rearrange the parts around the loop into the order shown, or
any similar order you like. Keep the “+” side of the parts in the same
direction as you move parts around the loop, and keep the light on the
solar cell the same as before. The LED brightness, fan speed, and
current shown on the meter should be the same no matter how you
order the parts.
Part B
This circuit has the battery (B4) and solar cell
producing voltage to push electric current through the
LEDs and motor. The current is flowing counter-
clockwise around the loop, and is the same through all
parts. If you rearrange the parts in the loop, without
changing their “+” orientation to the flow of current,
then you have exactly the same circuit.
See projects 1 & 3 if you need to recharge the battery (B4).