Hand generator with filters and pulley

For converting electrical energy into mechanical energy and vice versa, for quantative comparison of mechanical and electrical work and for calculating efficiency;
DC motor with gearbox in transparent housing, additional built-in filter to suppress unwanted signals (to fulfil EMC directives), built-in E10 lamp socket on the front, metal cord reel with deep groove, plug-in double cable with two 4 mm plugs
Power: 0 ... 6 V DC, 0 .... 1 A
Cord reel: D=30 mm
Cable length: approx. 50 cm
Dimensions: approx. 137 x 48 x 106 mm
Weight: approx. 172 g