An LED can be tested with an ohmmeter.

More Questions from Diodes and Applications

• The PIV rating of a diode in a full-wave bridge rectifier is more than that required for a full-wave center-tapped configuration.
• Dark current is a small reverse current that flows in a photodiode that is receiving no light.
• A rectifying diode can change ac voltage to dc voltage.
• The positive lead of a diode is the cathode.
• A reverse biased diode will act as an open switch.
• Doping semiconductive material is the process of putting a small amount of pentavalent or trivalent atoms in with tetravalent atoms.
• The barrier potential is the small difference of potential created by positive and negative ions on either side of the depletion region.
• If a bridge rectifier is used, it is not necessary to use a transformer.
• A common problem with rectifiers is open diodes.
• Reverse biasing a pn junction allows the flow of majority current.

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