This article aims to study global path planners algorithms using a mobile robot in the ROS (Robot Operating System) framework. Experiments were carried out in different environments, aiming to apply the Dijkstra and A * algorithms in simulation. The tests were performed with the robot TurtleBot 3 Burger, which runs using open source software. Location and orientation data from the sensors of the robot were stored. After analyzing the results, there was a slight superiority of Dijkstra algorithm from the ROS libraries, in relation to the A * algorithm in the environments with obstacles.