A movable body — Robots may have wheels, limbs connected by mechanical joints, or other types of movable segments. An actuator — In order to be activated, robots may use an electric motor, a hydraulic system, a pneumatic system or a combination of all three.
A power source — A robot needs a power source to drive its actuators. Electric robots use batteries or extension cord. Hydraulic robots need pumps to pressurize the hydraulic fluid, and pneumatic robots need air compressors.
An electrical circuit — The electrical circuit powers the electric motor, solenoid or valves that control hydraulic or pneumatic systems.
A re programmable brain (computer) — The computer controls all other components. In order to change the robot’s behavior, you just have to reprogram the computer.
A sensory system — Some robots have the ability to collect information about their environment and react to it.