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Below are 3 circuit diagrams illustrating the usage of diodes.
After you've built these circuits on a breadboard, you'll notice that the LED from circuit 1 lights up but the LED's from the other circuits dosen't. Do you know why?
Recall that a diode only lets current flow in 1 direction. In circuit 2, the diode is placed in the opposite direction from circuit 1. It is not allowing current to flow through. Remember that LED's are diodes too. In circuit 3, the LED is placed so that it is opposing electron flow so it is not lighting up.
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