To show qualitatively energy conversion from one form of energy to another in different ways. The kit comprises a number of separately available units. All units are mounted on a 160 x 140 mm base and have 4 mm socket terminals where needed.Copper calorimeter 60 x 6 mm with integral pulley, 20 mm diam. rotates in a boss, mounted on base. The friction brake consists of corklined jaws on pillar, also mounted on base.