The diagram portrays how a solar panel is structured and used .
Overall
, it can be noticed that energy is generated through sunlight with the use of both water and Linking Words
air
 , both sources undergoing 3 steps and having the same transparent top box with some slight changes in working mechanism and structure .
Use synonyms
To begin
 with , solar panels Linking Words
to 
Change preposition
apply
air
 heat Use synonyms
starts
 when cool Change the verb form
start
air
 enters through the inlet where it's Use synonyms
then
 in contact with sun rays passing via the transparent top and into the box , it ends when the Linking Words
air
 is now heated and is passed out from the outlet .
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On the other hand
 , heated water solar panels work almost identically , the major difference is Linking Words
instead
 of Linking Words
air
 coming in and out of the inlets and Use synonyms
outputs
 its water and it Wrong verb form
outputting
also
 needs a pipe to connect both sides Linking Words
unlike
 Add the comma(s)
,unlike
air
 which moves freely in the box .Use synonyms