How Gears Work | HowStuffWorks
Gears are used in tons of mechanical devices. They do several important jobs, but most important, they provide a gear reduction in motorized equipment. This is key because, often, a small motor spinning very fast can provide enough power for a device, but not enough torque.For instance, an electric screwdriver has a very large gear reduction because it needs lots of torque to turn screws, bu ...