It contains a source of electrical energy (the dry cells in the flashlight), a load (the bulb) that changes the electrical energy into a more useful form of energy (light), and a switch to control the energy delivered to the load.
(It; contains; a source of electrical energy) (a load; changes; the electrical energy; into a more useful form of energy (light) (the energy; delivered; to the load)
It a load the energy
contains changes delivered
a source of electrical energy
the electrical energy into a more useful form of energy (light
to the load