DC electric machine principle

Model for the explanation of DC electric machine principle.
Two DC machines - dynamo and electromotor mounted on the base. Dynamo is put into motion by hand crank and electromotor by electric source. 
Material: dynamo, electric motor, light bulb 12 V, wood, plastic
Power supply: 12 V
Dimensions (cm): 10 x 60 x 60
21IQ-0077