Big Thrust

Project Number: 80

Description: This circuit combines several power sources to run several devices in series. Build the circuit shown and then place the solar cell (B7) in sunlight or near an incandescent lamp. Set the switch (S5) to position B. If your light is bright enough, the LEDs may be dimly lit, and the fan may spin if you give it a push to get it started. Now turn the hand crank clockwise to make more power. The LEDs should be brighter, and the fan should spin faster.

Snappy: It takes a lot of voltage to run both the LEDs and the motor when they are connected in series, but combining the battery, the solar cell, and the hand crank gives enough voltage.