The components which produce the energy in the form of current or voltage are called as active components.
The components which stores the energy in the form of current or voltage are called as passive components.
Q.with out any training on domain with out any document only with the help of build screen is it possible to write testcases.
yes it is possible to write the test cases with the screen nut only the happy flow of the test cases can be written. in order to write behaviuoral testing you need to know the exact functionality of the software either written in document or through the training.