What is drivetrain and powertrain and why is it important?

The powertrain is composed of everything that makes the vehicle move. These components include the engine which generates the initial energy, the transmission that distributes it and produces torque and all the other components of the drivetrain that help to propel the body forward. It can be expressed in terms of a mathematical equation for simpler understanding:

Powertrain = [Engine] + [Drivetrain]
The output from the power sources are controlled by a transmission system and the driveline to deliver torque to the wheels. The circular motion of the crankshaft is transmitted to the rear wheels through the gearbox, clutch, universal joints, drive shafts or propeller shafts, the differential and the axles connected to the wheels.
The application of engine power to the driving wheels through the collaborative effort of each of these components is called the power transmission. All wheel drive vehicles have two sets of these components to distribute the power almost equally to the front and the rear.
The drivetrain is the part of a motorized carriage that connects the engine and transmission to the wheel axles through a number of other components. Drivetrain consists of all components after the transmission.

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