ECEN 325 EXAM 2 questions &
answers rated A+ passed
Diodes - correct answer ✔✔ a device that allows the flow of electrical current in only one
direction
I understand the basic physics of a PN junction - correct answer ✔✔ an interface between two
types of semiconductor materials (p-type and n-type semiconductors) inside a single crystal of
semiconductor. The positive ("p") side contains an excess of holes, while the negative ("n") side
contains an excess of electrons in the outer shells of atoms within the semiconductor.
Doping - correct answer ✔✔ impurity atoms change the properties of pure semiconductors (N
adds electrons, P adds holes)
The atom difference between insulators, semiconductors, and conductors - correct answer ✔✔
insulator: largest band gap between conduction band and valance band, semiconductor: in the
middle, conductor: smallest gap
Drift current vs current conduction - correct answer ✔✔ the process of sequential migration of
electrons from one atom to the next is called electron drift, and it is this process that gives rise
to the flow of conduction current through a circuit
The depletion region - correct answer ✔✔ diffusion over time, exchange of positive donor ions
and negative acceptor ions, t = infinity
The diode regions of operation - correct answer ✔✔ forward bias - lots of current, reverse bias -
little current
answers rated A+ passed
Diodes - correct answer ✔✔ a device that allows the flow of electrical current in only one
direction
I understand the basic physics of a PN junction - correct answer ✔✔ an interface between two
types of semiconductor materials (p-type and n-type semiconductors) inside a single crystal of
semiconductor. The positive ("p") side contains an excess of holes, while the negative ("n") side
contains an excess of electrons in the outer shells of atoms within the semiconductor.
Doping - correct answer ✔✔ impurity atoms change the properties of pure semiconductors (N
adds electrons, P adds holes)
The atom difference between insulators, semiconductors, and conductors - correct answer ✔✔
insulator: largest band gap between conduction band and valance band, semiconductor: in the
middle, conductor: smallest gap
Drift current vs current conduction - correct answer ✔✔ the process of sequential migration of
electrons from one atom to the next is called electron drift, and it is this process that gives rise
to the flow of conduction current through a circuit
The depletion region - correct answer ✔✔ diffusion over time, exchange of positive donor ions
and negative acceptor ions, t = infinity
The diode regions of operation - correct answer ✔✔ forward bias - lots of current, reverse bias -
little current
