The device that provides power for a mechanical power transmission is called which of the following?

• A. Prime Mover or Driver
• B. Motor
• C. Generator
• D. Battery

Answer: (A)

The device that provides power for a mechanical power transmission is the prime mover or driver. This is the energy source that converts fuel, steam, electricity, or other energy forms into mechanical energy to actually drive the machinery in the transmission.

A motor, while it creates motion by converting electrical energy into mechanical energy, is typically a consumer of electrical power and part of the load that’s driven, not the primary source for the transmission itself. A generator does the opposite—turns mechanical energy into electrical energy. A battery stores chemical energy and supplies electrical power, but it isn’t the direct source of mechanical power for the transmission unless paired with another device to convert that energy into motion. Prime mover is the term that correctly identifies the device providing the mechanical power.