This final paper is based on the comparison of asynchronous and synchronous machines, which is also the topic of this paper. The paper is based on the analysis of asynchronous and synchronous machine as an individual machine with its components, measurement in operation, analysis of machine, construction, development needs, operating modes and performance types of asynchronous and synchronous machines. This final paper is divided into nine main chapters: "Introduction", "Historical development of electrical machines", "Synchronous machine", "Asynchronous machine", "Starting synchronous motors", "Starting asynchronous motors", "Areas of operation of electrical machines", "Testing in assembly and operation "," Registration form for the offer of asynchronous motors (KONČAR) ". Each of these chapters answers the problem and the question asked in the assignment for this final work. The first part is: "Introduction" where the work is presented and gives the reader a rough picture of the work. The main concepts such as synchronous and asynchronous machine, modes of their operation are explained. The second part is: "Historical development of electrical machines". This part of the paper answers the following question: "First, the historical development of both types of electrical machines will be explained.". It is important to understand the need to develop electrical machines to facilitate life needs. Each electric machine is based on three laws of electrical engineering Faraday's law of electromagnetic induction, Ampere's law of flow, and the law of force on a conductor in a magnetic field. The third part is: "Synchronous machine". Answering the question: "The main characteristics of asynchronous and synchronous machines, basic parts, and their role will be stated.". The third unit focuses exclusively on the synchronous part. We get to know the basics of synchronous machines such as excitation, armature, rotor, stator, poles, synchronous speed. We learn that the synchronous machine got its name from this because it runs at synchronous speed. Synchronous machines can operate as generators or motors, and most commonly operate in generator mode. According to the type of propulsion machine, there are turbogenerators, hydro generators, diesel generators, compensators and engines. According to the speed of rotation, synchronous machines are divided into high-speed, medium-speed and slow-speed machines. The rotor design can be cylindrical rotors or with prominent poles. The fourth part is: "Asynchronous machine". Namely, this unit completes its half of the question: "The main characteristics of asynchronous and synchronous machines, basic parts, and their role will be stated.". Where only asynchronous foreign issues are addressed. Asynchronous machines, unlike synchronous machines, are most often used in practice as electric motors. Asynchronous machines work on the principle of a rotating magnetic field with a multiphase three-phase system. The construction of an asynchronous machine is similar to a synchronous machine, the essential difference is in the rotor of the machine because it is not supplied with current from an external source but by an induced magnetic field from the stator. Its velocity is different from the synchronous axis n ≠ n_s. Asynchronous machines are more used in use for their simplicity and reliability. Lower power than synchronous machines, they are made for lower and medium power. Cheaper in price. The rotor winding can be the same as the stator of coils or rods, depending on the type of winding asynchronous motor can be sliding or cage. Cage motor cheaper in price and lighter than sliding motor, the most reliable and most used motor. The fifth part is: "Starting synchronous motors". This unit answers the question "Special attention will also be paid to their initiation and mode of operation." In order to be able to start a synchronous motor, the ratio between the rated current and the starting current is important, as is the ratio of the motor torque and starting current. The synchronous motor in synchronism develops only the useful moment, while outside synchronism it does not develop. Synchronism can be achieved in three ways: asynchronous start, start with auxiliary motors and with frequency converter. The star-delta switch serves to mitigate the electric shock when the motor is connected to the mains and by switching from the star to the triangle. The sixth part is: "Starting asynchronous motors". This unit answers the question: "Special attention will also be paid to their initiation and mode of operation.". The problem that can occur when starting AC motors are large traction currents, which can be much higher than predicted (rated). Traction currents can create a problem when starting the motor, so that excessive amounts of traction currents strike the motor network. The problem can be solved in starting a star-triangle. The seventh part is: "Areas of operation of electrical machines". This unit continues with the second half of the question: "Special attention will also be paid to their initiation and mode of operation.". The whole includes both synchronous and asynchronous part. An asynchronous motor can operate in three different ways: motor mode, generator mode, and braking. A reversible hydropower plant is a place where synchronous machines have a dual application, depending on the need to operate in generator or motor mode. The eighth part is: "Testing in assembly and operation". This unit answers the question: "Finally, the testing and measurements performed during construction and operation, and the external characteristics of synchronous and asynchronous motors will be described.". In this unit, it is about the proper maintenance and construction of EMP. What things to look out for when installing and making electrical machines. The importance of short-circuit and idle testing in asynchronous and synchronous machines, which can give us information about losses and EMP issues.