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    when a pn junction is forwardbiased it behaves as
    short circuit
    p type
    n type
    open circuit
    which one is right
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    [QUOTE=zahra tanvir;78896190]when a pn junction is forwardbiased it behaves as
    short circuit
    p type
    n type
    open circuit
    which one is right
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    try putting this in the physics forum, you'll be more likely to get a response
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    (Original post by zahra tanvir)
    when a pn junction is forwardbiased it behaves as
    short circuit
    p type
    n type
    open circuit
    which one is right
    Look at the diode characteristic curves.



    With the junction forward biased and as long as the threshold voltage is exceeded, it will behave as an approximate short circuit. i.e. current is unlimited.

    In practice, there is a small resistance across the junction, which is the reason why diodes must have a series current limiting resistor in circuit - to avoid destruction of the diode through excessive power dissipation.
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    thankyou
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