A typical electrical system may include _____

A)
only generator
B)
only transformers
C)
drag polar system
D)
generators, transformers, cables, etc

Correct Answer :   generators, transformers, cables, etc


Explanation : A typical electrical system consists of generators, transformers, cables etc. It is used to provide electrical energy. Drag polar is graphical representation of drag. It is used to show relationship between drag and lift.