Motors are electric; engines are internal combustion. Cheap motors in toys are inrunners that use ferrite magnets. The input voltage determines the RPMs and the input electric current the torque. The motors that we use have a linear relationship between torque and RPM for a given voltage. Maximum torque occurs at zero RPM and results in maximum electric current being drawn. Maximum RPM occurs when there is no load on the shaft. The power produced by a motor is the product of the RPMs and the torque.