Overall Review Flashcards
Invented the first practical electron tube called the ‘fleming valve’
John Ambrose Fleming
AKA Electron tube
It is a sealed glass or metal-ceramic enclosure used in electron circuitry to control the flow of electrons between the metal electrodes sealed inside the tubes
Vacuum Tubes
Came into its own invention of the transistor in 1947
Solid state device
The opposite of vacuum technology, which depended on the continuous and free flow of electrons
Solid state
Classes of solid-state materials:
- Insulator
- Semiconductors
- Conductors
Materials that permit electrons to flow freely
Conductors
Materials that impede the flow of electrons
Insulators
Materials that are neither a good conductor or a good insulator; when the temperature is low, it acts as an insulator
Semiconductors
An electric circuit component from a material that is neither a good conductor or a good insulator
Semi-conductor devices
Major semi-conductor material
Germanium
Modern day semiconductor devices
- transistors
- resistors
- ICs
- operational amplifier / 143
- diodes
Types of semiconductors
- P-type (carries the current as the charged holes move)
2. N-type (carries are negative)
Resists the flow of the current
Resistors
Provides the first digit of the code
1st band
Provides the second digit of the code
2nd band
Provides the multiplier of the code
3rd band
Indicates the tolerance value
4th band
Stores an electric charge between two plates
Capacitors
Unit of the capacitors
Farads
The materials between the plates of the capacitor
Dielectric material
REMINDERS
- Electrons on the left plate are attracted towards the positive terminal of the voltage source
- Electrons are pushed towards the right plate
- Excess electrons leaves a negative charge
Device that lets current pass only in one direction
Diode
Two leads of the diode
ANODE (POSITIVE) and CATHODE (NEGATIVE)
The interface b/w p and n type
Pn-junction (Junction)
A barrier b/w the p and n type silicon that contains no free electrons of holes
Depletion zone
The condition that permits current through the pn-junction of the diode
Forward bias
The condition where the depletion zone widens until its potential difference equals the bias voltage, majority-carrier current ceases
Reverse bias
Process of adding extra electrons
Doping (BTS nyehehehhe)
Process of adding holes
Doped with “holes”
Designed to pass electrons from the emitter to the collector
NPN BJT Transistor
Designed to pass electrons from the emitter to the collector that flows in the opposite direction; the emitter emits “holes” which are collected by the collector
PNP BJT Transistor
