Gears can be connected together to take various shapes and sizes, depending on the intended application. When the power is being transmitted from a gear reducer motor to the other parts of a machine, any one of the following things will occur:
If you have a pair of gears with the second wheel having more teeth than the first wheel, or if it has a bigger wheel, it will turn slower than the first one. However, the second wheel has more force even if it moves slower than the first wheel.
As opposed to the scenario above, connecting two gears together with the first having more teeth or has a bigger-sized wheel than the second one, the latter has to move around quicker in order to keep up with the first wheel. It only means that the second gear moves faster but uses less force than the first one. In other words, the wheel with more teeth will go twice as fast as the one with fewer teeth but with only half as much force. A basic gear reducer motor works with this simple principle.
Every time two gears meshed, one gear turns in the opposite direction of the other. It means when the first gear turns clockwise, the other one moves counterclockwise. There are also special gears that can provide power through an angle as with the case of a car. The gearbox located in the middle of the rear axle of the car employs a cone-shaped bevel gear to power the driveshaft via a 90-degree turn, which powers the back wheels of the said car.