Which of the following best describes the function of an actuator?

The function of an actuator is to convert energy into mechanical motion. Actuators are devices that, upon receiving a control signal, produce a specific movement or action. This conversion typically involves electrical energy being turned into mechanical work. For example, electric motors, hydraulic cylinders, or pneumatic devices can serve as actuators, transforming input energy into motion that can then be used to control a system or process, such as opening a valve or moving a robotic arm.

The other options describe different functions that are not directly related to the primary role of an actuator. Regulating hydraulic pressure pertains to control systems and valves, storing electrical energy relates to capacitors or batteries, and fluid filtration is a function associated with filters in fluid systems rather than actuators that produce movement. Understanding the specific role of an actuator helps in various engineering applications where precise control of movement is essential.