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Theory Final
| Question | Answer |
|---|---|
| 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
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