Electronics
T2a
T2a
Set of flashcards Details
| Flashcards | 474 |
|---|---|
| Language | Deutsch |
| Category | Electronics |
| Level | Primary School |
| Created / Updated | 12.01.2015 / 21.01.2020 |
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Where is a solenoid often used?
Circuit breakers are fitted in...
What is the result when current passes through a rectifier?
A transformer is a device for:
In a two generator system, a differential relay will ensure that
Full wave rectification of a single phase AC supply requires an arrangement of:
The rating of an AC generator is usually given in...
An air-driven generator (RAT) supplies
Heaters and electrical de-icing systems can be supplied by frequency-wild AC with voltage regulation because...
The advantages of alternating current on board an aircraft are :
1. simple connection
2. high starting torque
3. flexibility in use
4. lighter weight of equipment
5. easy to convert into direct current
6. easy maintenance of machinesThe combination of correct statements is
In an aircraft electrical system where AC generators are not paralleled mounted, the changeover relay allows
Two AC voltage levels are available in...
The induction motor has...
When load sharing AC generators, real and reactive loads are adjusted by controlling
Field excitation of an AC generator when running is provided by...
Atom besteht aus
Protons (+), neutrons and electrons (-) => protons and neutrons forms the nucleus around the electrons move very rapidly in certain shells
Th electrons in the outermost shell calls
valence electrons
Heat effect
electrons move in in one direction = voltage => While traveling on their way through the conductor => these oscillations produce heat
Ions?
are the carrier of electrical charge in liquid or gases
conductors
are metals (aluminum/cooper, silver, gold)
some liquids also belong to teh group of conductors => different to metals?
no electrons but ions move
Semiconductors
have a very weak conductivity => after a certain contamination a certain voltage is attained
conductivity
conductivity = the electrons in the outermost shell of the material determine its electrical conductivity
Isolators (Insulators)
have many electrons in the outermost shell (3 to 8) => no free electrons => The electrical resistance is almost infinite
effect of light
Bohrs model => greater the distance of the electron from the core, the greater is the energy level of the electron => quantum jump from on to another orbit
=> The light effect by the quantum jump can be produced withe different material
=> fall back to a lower orbit and emit photons of light, which can be seen as visible light
Light Bulb
Inside: either a cave or low pressure inert gas => The heating of the filament causes it to emit light and the vacuum/inert gas prevents the filament from burning out due to evaporation
Fluorescent lamp
the glass tube, which contains two electrodes at each end and a gas => both electrode filaments very quickly and emits electrons to ionize the argon gas inside the tube ==> ignites the gas with a very high voltage
Light emitting diode (LED)
two semiconductors layers=> low voltage electrons are moved from one semiconductor material to another semidconductor material => In the penetration (Durchdringung) of the other semiconductor material light photons are generated ==> High efficiency low pr
Generator
a magnetic field rotates inside a conductor loop and produces an alternating voltage => When a load is connected to the conductor loop, an AC results
Battery
the chemical effect of electricity is used to produce voltage => two different solid conductors are submerged on a liquid conductor
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