Data Sheet

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65. Gears

Build the circuit as shown on the left, turn the hand

crank generator (94 & 99) clockwise, and you will

light up three LEDs and the lamp (76) at the same

time.

If you look inside the hand crank, you will

see several toothed wheels called gears. Gears

are used to alter the relation between the speed of

the driving mechanism (the hank crank) and the

speed of the driven part (the shaft from the

generator (99)). In this case the gears are setup so

that the shaft from the generator (99) spins much

faster than the speed at which you turn the hand

crank (94).

66. Usage of Gears

Build the circuit as shown on the left, turn the hand

crank generator (94 & 99) clockwise, and you will

light up the LED (69) and lamp (76) and hear the

alarm (78) sound.

The gears in the hank crank (94) are designed to

make the shaft of the generator (99) spin faster than

you spin the hand crank (94). Gears are everywhere

where there are engines and motors producing

rotational motion. For example, car engines and

transmissions contain lots of gears. In addition to

increasing or decreasing rotational speed, gears

can also reverse the direction of rotational motion,

move rotational motion to a different axis, and keep

rotation of two axis synchronized.

1st level

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