Learning Hub Quiz Flashcards
Name three electrical classifications
conductor
insulator
semi conductor
What is the valence shell?
outermost shell
How many electrons are there in a GE atoms valence shell?
4
Name two types of semi conductors.
silicon and germanium
Name three clasifications of matter.
chemical, physical, electrical
How many electrons are in a silicone atom?
14
What determines the electrical stability of an atom?
how close valence shell is to core
What is an intrinsic material?
pure material (p type)
Which semi conductor is more stable and why?
silicon because valence shell is closer
What term is used to describe when electrons in the valence shell are shared between two or more atoms?
covalent bonding
Name three physical classifications of matter
solid
liquid
gas
Define complex matter.
two basic earth materials
How many electrons in the valence shell of a SI molecuele?
4
How is a silicone crystal formed l and what is it’s charge?
through covalent bonding and has a neutral charge
What is doping and why is it done?
Adding impurities to increase conductivity
An impurity with five electrons in its valence shell is called what?
what is the over all charge?
pentavalent
pos
How many electrons are in the valence shell of a “p” type material
4
What is the difference between an N type semi conductor and a P type semi conductor?
what is the overall charge of each?
N type = free electrons (neutral)
P type= holes (neutral)
Name 4 impurities used in a “P” type semi conductor?
Gallium
Aluminum
Indium
Boron
Name three impurites used in an “N” type semi conductor?
Phosphorus
Antimoni
Arsenic
In what direction does the hole apear to move in a “P” type semi conductor?
what direction does the current flow?
neg to pos
What direction does current flow in an “N” type semi conductor?
What are the free electrons called?
neg to pos
holes
what is the construction of a diode?
joining p type and n type material
What is the area between the “P” and “N” on the diode called?
depletion region
What type of material is the anode made of?
What type of material is the cathode made of?
P type and N type
What is knee voltage?
what is the knee voltage for si and ge?
cut in voltage
0.7SI and 0.3GE
When there is a negative voltage aplied to the “P” junction what Bias is the diode in?
What hapens to the depletion region?
Reverse bias, it grows
what polarity is the voltage applied to the cathode to cause it to be forward bias?
negative
What is PIV?
Peak inverse voltage
What component is added to a diode when voltage is incresed dureing forwad bias?
heat sink
What term is used when to much voltage is aplied when in reverse bias and what will happen to the diode?
Voltage breakdown reverse / avalanche
what is a way of marking the cathode on a diode?
Vertical bar indicates cathode (neg)
What is a common diode used in every day life that every one is familiar with?
LED
What is VBR
Voltage breakdown reverse - diode conducts too much and destroys itself
