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Circuits:
It's a complete, closed path through which electric charges flow.
Electrons move from from the negatively charged p-type layer toward the positive terminal. As a result, electrons from the n-type layer can move to fill the newly created 'holes' in the p-type layer, and a current is made.
A closed circuit is when two pieces of the conducting material touches.
An open circuit is when there is a gap between the two conducting material- prevents the current.