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Theory Final

QuestionAnswer
how many valence electrons do the atoms in intrinsic conductors have? 4
what are two most common intrinsic semiconductor materials? germanium and silicon
what type of semiconductor material can withstand the greatest amount of heat? silicon
what is the difference between an intrinsic semiconductor material and an extrinsic semiconductor material? number of valence electrons
how many valence electrons would an impurity have that i would add to make a p-type material? 3
what are the majority current carriers in a n-type semiconductor? electrons
if a diode is made from silicon, about how many volts does it take to turn it on so that it will conduct current in the forward direction? .7v
what happens in a common junction diode if i apply a reverse voltage greater than its rated peak inverse voltage? breakdown occurs. current flows in the reverse direction and the common junction diode is destroyed
what does a heat sink do for an electronic component and how does a heat sink work? helps reject more heat to the air around it. works by increasing the surface area of the component
what is a rectifier? converts ac to dc
what job does a zener diode typically do in a circuit? regulates voltage
what is the primary function of a silicon bilateral switch? bi-directional (ac) device used to trigger the gate of a triac
what characteristic permits the bilateral switch to conduct current at a lower voltage than it takes to turn it on? it has a dynamic impedance curve with a negative resistance once the breakover voltage is achieved
does do the letters SCR stand for? silicon controlled rectifier
three terminals of SCR gate, anode, and cathode
how is current flow turned off after its been turned on? the amount of current through anode and cathode must be reduced to a level below the holding current
how many layers of semiconductor material are required to make a transistor? 3
two major types of transistors NPN or PNP
why is silicon used more often than germanium? withstand more heat
what is the most common system used in the identification of transistors? 2N Registry
when a transistor is driven into saturation, how much voltage is dropped across the collector-emitter section? .3v
how is a transistor driven into saturation? providing more current through the base-emitter junction than is required to operate normally
why is it desirable to drive a transistor into saturation? more power is available to the load
what is a disadvantage of driving a transistor into saturation? slower operating frequency
SCR on state- off state- on-close contact off-open contact
how is voltmeter connected in circuit? parallel
how is ammeter connects in circuit? series
base (b) connection control current
collector (c) connection source of the power current
emitter (e) connection output of the power current
what are the majority current carriers in a p-type semiconductor? holes
LED light emitting diode
SSR Pros longer life, does not generate as much electromagnetic interference, more resistant to shock
SSR Cons contains semiconductors that can get damaged from voltage spikes, ON- state resistance and OFF-state leakage current, produce more heat
Created by: jairoandres90