With the illustrated backpack project above, it is intended to take advantage of, in the generation of electrical energy to operate portable electr...

With the illustrated backpack project above, it is intended to take advantage of, in the generation of electrical energy to operate portable electronic devices, part of the energy wasted in the act of walking. The energy transformations involved in producing electricity while a person walks with this backpack can be schematized as follows:

The energies I and II, represented in the above scheme, can be identified, respectively, as
a) kinetic and electric.
b) thermal and kinetic.
c) thermal and electric.
d) sound and thermal.
e) radiant and electric.