Final Review Sheets Flashcards
When atoms of a purified semiconductor material arrange themselves in a pattern, the pattern is called?
crystal-lattice
Two common types of semiconductor elements?
germanium
silicon
The sharing of valence electrons by adjoining atoms in a crystal-lattice structure is called?
covalent bonding
By doping a pure semiconductor with a trivalent impurities, a/an type semiconductor is formed?
P-type
An N-type semiconductor has an excess of?
electrons
Semiconductors have a ______________________ coefficient?
negative temperature
why is silicon more commonly used than germanium for semiconductor devices?
silicon can withstand higher temperatures
barrier potential of silicon?
.7v
What happens if the PIV of a diode is exceeded?
current avalanches
When using the Sanwa VOM to test a diode, what is the polarity of the leads?
black is positive
red is negative
Zener diodes are connected in ________?
reverse bias
A zener silicon diode connected in forward bias would have a voltage drop of?
.7v
An LED operates in?
forward bias
A semiconductor substrate doped with arsenic would be considered as _________-type semiconductor.
N
The forward current rating of an LED should not exceed _________mA
50
The PIV rating of an LED is about ______ volts
6
A clipper or surge suppressor circuit (to protect a load against peak voltage levels) can be constructed by using a device called a ___________?
varistor
zener diodes are most commonly used in DC circuits as a ______ _________?
voltage regulator
When a diode is connected across an inductive DC load (to protect arcing during switching operations), it is often called a _____________ diode.
freewheeling
Reverse-bias is a term used to indicate that the Anode is _________ with respect to the Cathode
negative
State how “N-type” semiconductor material is made?
By doping pure semiconductor (silicon) with appropriate pentavalent element such as arsenic
Definition of Peak Inverse Voltage?
Max reverse voltage applied to diode without breaking it down
