Which statement about end effectors is true?

• A. End effectors are the tooling that enables a robot to perform a task, such as grippers or tools.
• B. End effectors monitor the robot's internal state.
• C. End effectors are the main processors controlling the robot's motion.
• D. End effectors are used to house the robot's power supply.

Answer: (A)

End effectors are the tool that actually interacts with the workpiece at the end of a robotic arm, turning motion into a task. They are chosen to match what the robot must do—grippers to grasp, welding torches to weld, suction cups to pick up smooth parts, drills or cutting tools to machine material, and so on. This makes them the means by which the robot performs its job; without an end effector, the arm would move but not accomplish the task.

This is why the statement describing end effectors as the tooling that enables a robot to perform a task is the best description. It highlights their role as the task-specific interface to the environment. Other aspects of robotics, like monitoring the robot’s internal state, controlling motion, or housing the power supply, are handled by sensors, the control system, and the power subsystem, respectively, not by the end effector itself.