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A circuit is a roughly circular line, route, or movement that starts and finishes at the same place.
The flow of electrons in a circuit move from the negatively charged p-type layer forward the positive terminal. As result electrons from n-type later can move to fill the newly created "holes" in the p-type layer, and a current is made
In a closed circuit, two pieces of conducting material touch, which allows the electric charges to flow through the circuit. In an open circuit, the gap between prevent the electric charges from traveling through the circuit.
Circuits