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प्रश्न
A good diode checked by a multimeter should indicate ______.
विकल्प
high resistance in reverse bias and a low resistance in forward bias.
high resistance in both forward bias and reverse bias.
low resistance in both reverse bias and forward bias.
high resistance in forward bias and low resistance in reverse bias.
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उत्तर
A good diode checked by a multimeter should indicate high resistance in reverse bias and a low resistance in forward bias.
Explanation:
A PN junction diode allows current mainly in one direction:
Forward bias → conducts easily (low resistance)
Reverse bias → blocks current (high resistance)
This property is used to test diodes using a multimeter.
When the diode is forward-biased, the depletion region narrows, current flows easily, and the multimeter shows low resistance.
When the diode is reverse-biased, the depletion region widens, resulting in a very small leakage current, and the multimeter shows high resistance.
A good diode must conduct in forward bias (low resistance) and block in reverse bias (high resistance).
