Final answer:
To ensure a diode is connected correctly, use a multimeter to check its conductivity and verify the polarity marking.
Explanation:
Diodes allow electric current to flow in one direction and block it in the opposite direction. To ensure a diode is connected correctly, you can use a multimeter to check its conductivity in the correct direction. Additionally, visually inspecting and following the diode's polarity marking can help confirm the right connection.
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