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The purpose of the source tries to explain why a given source was used while the context explains the setting.
It is the energy source. It is using as the energy source.
purpose
It is energy source
The main source of propulsion.
So u can run
The purpose of cables are to transfer electricity from some kind of power source to the object it is powering.
Shadows do not have a purpose, they are just the absence of light created when an object blocks a light source.
It is a source of revenue for the NFL.
it is used for re-compilation of your source file
To give credit to the original source
the purpose of an eftpos receipt is to approve of a purchase. it is a source document which is used for evidence of purchase.