Which formulation most accurately defines what an Actuator is?

Select one alternative:

actuator is a component that converts velocity and acceleration into electrical signal, to

preform physical actions on/in our system and automate process

actuator is a component that converts mechanical energy into electrical signal, to

preform physical actions on/in our system and automate process

actuator is a component that converts one form of energy into useful work (mechanical

energy) to preform physical actions on/in our system and automate process

actuator is a component that converts force into electrical signal, to preform physical

actions on/in our system and automate process