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Questions and Answers
What primarily creates the drift current in a depletion region of a PN junction?
What primarily creates the drift current in a depletion region of a PN junction?
- Movement of free electrons towards the anode
- Temperature difference across the junction
- Electric field established by fixed ions (correct)
- Diffusion of holes from the p-side
At equilibrium in a PN junction, what happens to the drift and diffusion currents?
At equilibrium in a PN junction, what happens to the drift and diffusion currents?
- Diffusion current becomes greater than drift current
- Both currents flow in the same direction simultaneously
- Drift current cancels out diffusion current, resulting in zero net current (correct)
- Drift current increases while diffusion current decreases
Which of the following describes the depletion region in a PN junction?
Which of the following describes the depletion region in a PN junction?
- The portion where current flows freely without resistance
- A zone containing only neutral atoms
- A region of fixed ions left behind by diffusing charge carriers (correct)
- A layer rich with mobile charge carriers
What condition must be met for a diffusion current to flow in a PN junction?
What condition must be met for a diffusion current to flow in a PN junction?
Which statement describes forward biasing of a PN junction?
Which statement describes forward biasing of a PN junction?
In a PN junction under reverse bias, which of the following is true?
In a PN junction under reverse bias, which of the following is true?
What is the effect of increased temperature on the currents in a PN junction?
What is the effect of increased temperature on the currents in a PN junction?
Which principle underlies the operation of a PN junction when applying a voltage?
Which principle underlies the operation of a PN junction when applying a voltage?
How does the presence of a fixed ion zone affect charge carrier movement in a depletion region?
How does the presence of a fixed ion zone affect charge carrier movement in a depletion region?
What occurs when the PN junction is reverse-biased relative to the current flow?
What occurs when the PN junction is reverse-biased relative to the current flow?
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Study Notes
Thévenin and Norton Equivalents
- Open-circuit voltage (Vt) is equivalent to voc.
- Short-circuit current (In) is equivalent to isc.
- Thévenin resistance (Rt) is determined by zeroing the sources and observing terminals.
- Vt and In are related by the equation Vt = Rt * In.
- Thévenin equivalent consists of a voltage source Vt in series with Rt.
- Norton equivalent comprises a current source In in parallel with Rt.
Maximum Power Transfer
- Maximum power transfer occurs when load resistance is equal to the Thévenin resistance.
Semiconductor Basics
- Semiconductors can function as good conductors or insulators; their conductivity is modifiable.
- Common semiconductors include silicon, germanium, and carbon; silicon is the most widely used.
- A semiconductor's properties fall between conductors (e.g., copper) and insulators (e.g., glass).
Depletion Region
- The depletion region forms as free electrons and holes diffuse across a junction, leaving behind fixed ions.
Current Flow in PN Junction
- At equilibrium, drift and diffusion currents are equal and opposite, resulting in zero net current.
- Drift current is caused by an electric field in the depletion region created by fixed ions.
Biasing a PN Junction Diode
- Forward bias applied to a PN junction influences how current flows through the junction.
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