This experiment demonstrates that a Diode and a LED will only pass current in a one-way direction. A diode's turn-on voltage is 0.7V. In the first picture, the Diode and LED are wired correctly and the circuit works. In the following two pictures, the Diode or LED is wired incorrectly and the circuit does not work.
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| Diode wired correct |
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| Diode wired wrong |
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| LED wired wrong |
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