Data Sheet

-45-
67. Electrical to Mechanical Energy
Build the circuit as shown on the left and you will
light up the heart LED (69) at once. If you turn the
hand crank generator (94 & 99) clockwise, you will
see the heart LED (69) become brighter and the
lamp (76) will be turned on.
Try removing the hand crank (94) from the
generator (99). Notice that the shaft on the
generator (99) may be spinning (if not you might
need to start it spinning with your nger). The
electrical power from the batteries is being
converted to mechanical power in the generator
(99) to spin the shaft.
68. Generators and Magnetic Fields
Build the circuit as shown on the left and you will
light up the heart LED (69) and the bi-directional
LED (71) at the same time. If you turn the hand
crank generator (99), you will see the heart LED
(69) and the bi-directional LED (71) become
brighter and the lamp (76) will be turned on.
Now put the magnet (7) near the generator (99).
Note that the magnet (7) is attracted to the
generator (99) at certain locations. This is because
generators have magnets inside them that create
a magnetic eld. When a current ows through this
magnetic eld (from the batteries in this circuit), it
creates a force (look up Fleming’s rule) that spins
the motor shaft.