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NEET · Physics · Semiconductor Electronics (Diodes) doubts
6 doubts found
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NEETPhysicshard
How does a diode turn AC into DC (rectification)?
A diode conducts only when forward-biased, so it passes current in just one direction.
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NEETPhysicshard
Why is a Zener diode used to keep a voltage steady (as a regulator)?
A Zener diode is designed to operate in reverse breakdown, where its voltage stays almost constant over a wide range of current.
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NEETPhysicshard
Why does an LED light up but only when connected the right way round?
An LED is a p–n junction that emits light when forward-biased: electrons and holes recombine across the junction and release the energy as photons, with the colour set by the semiconductor's band gap.
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NEETPhysicshard
What actually happens inside a p–n junction the moment you forward-bias it?
At rest, a depletion region with a built-in barrier stops most carriers crossing.
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NEETPhysicseasy
What does “Forward & reverse bias” actually mean in Semiconductor Electronics (Diodes), and why does it matter for NEET?
forward bias (p to +, n to −) lowers the junction barrier and lets current flow; reverse bias widens the depletion region and blocks it.
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NEETPhysicsmedium
I keep getting “Forward & reverse bias” questions wrong in Semiconductor Electronics (Diodes). What's the trap?
thinking a diode conducts equally both ways.
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