QT in TLE Flashcards
He invented the first practical electron tube called “Fleming Valve”.
John Ambrose Fleming
It is also called the electron tube.
Vacuum Tubes
A sealed-glass or metal-ceramic enclosure used in electronic circuitry to control the flow of electrons between metal electrodes sealed inside the tubes.
Vacuum Tubes
Within a vacuum bulb, a ? is heated (directly or indirectly).
Cathode
What do you call the metal cylinder surrounding the cathode?
Plate
Came on its own with the invention of the transistor in 1947.
Solid state device
The opposite of vacuum technology. It also used in contrast to any device with a moving part, such as hard disk drive.
Solid state
Name the solid state materials.
Conductors, insulators and semi-conductors.
Materials that permit electrons to flow freely from particle to particle.
Conductors
Materials that impede the free flow of electrons from atom to atom and molecule to molecule.
Insulators
Neither a good conductor nor a good insulator.
Semiconductors
During the early 1950s, what was the major semiconductor material?
Germanium
During the early 1960s, what has become the practical substitute for semiconductor material?
Silicon
At high temperature its conductivity approaches that of a what?
Metal
Same question from before but at low temperature?
Insulator
Examples of modern-day semiconductor materials.
Transistors, resistors, ICs, operational amplifiers, diodes.
The 2 types of semiconductor:
N-type and P-type
Carries negative electrons.
N-type
Positive charged holes move and carry the current.
P-type
They come in variety of shapes, sizes and forms. They have value of resistance printed on them or as a color code.
Resistors
What the does the 1st band indicates in a resistor?
First digit of the code
The 2nd?
Second digit of the code
The 3rd?
Multiplier
The 4th??
Tolerance Value
Arrange the color of the bands.
Black, brown, red, orange, green, blue, violet, gray, white, gold, silver.
What is the function of a capacitor?
It stores electrical charge between two plates.
Unit of capacitance.
Farads
What is the material between the plates of a capacitor?
Dielectric material
A device that passes current in only one direction.
Diodes
The 2 leads of a diode, indicate their sign.
Anode (+) and Cathode (-)
What do you call the interface between p-type and n-type material?
PN-Junction
The intersection between p and n side.
Junction
A barrier between the n-type and p-type silicon that contains no free electrons or holes.
Depletion zone
DC Voltage positive terminal connected to the p region and negative to the n region. It is the condition that permits current through the pn-junction of a diode.
Forward bias
Negative terminal connected to the p-region and positive to the n-region.
Reverse bias
Fundamentally three-terminal devices.
Transistors
Arrange in order of the pins in NPN transistor:
C-B-E
In PNP transistor:
E-B-C
When layers have extra electrons added to them, the process is called?
Doping
True or false? Electrons can easily flow from the p-type to n-type collector as long as the base-emitter junction is reversed biased.
False (forward biased)
The ? is designed to pass electrons from the emitter to the collector.
NPN BJT transistor
Instead of electrons, the emitter emits “holes” which are collected by the collector.
PNP BJT transistor
WRITE A IF IT DESCRIBES A SOLID STATE DEVICE AND B IF NOT.
It is invented since 1950s.
B
Insulator is an example of it.
A
The device is within a vacuum bulb.
B
Made up of cathode and anode.
B
Opposite of vacuum technology.
A
Used to build devices with a vacuum
B
Needs 2 external sources to function
B
Contrast to any device with any moving part.
A
Depended on the continuous flow of electron charges
A
Commonly grouped in two classes: n-type and p-type.
B
