Final answer:
Linear actuators enable straight-line motion and precise rotational movements. Solenoids use electromagnets to operate power switches, while motors convert electrical energy into mechanical work.
Step-by-step explanation:
Linear actuators enable motion of objects or elements in a straight line. They are commonly used to control precise rotational movements of device components or whole objects. Solenoids are electromagnetic actuators that use electromagnets to operate power switches in various applications such as lamps, heaters, and smart vehicles. Motors, on the other hand, are devices that convert electrical energy into mechanical work and are commonly used to control motion using loops of wire in a magnetic field.