Ellära för intresserade - SyntaxSociety

09-01-07
Innehållsförteckning
Del 1 - Bara, och endast, grunderna......................6
Ström................................................................6
Synonymer...................................................6
Bieffekter.....................................................6
Ampere.........................................................6
Spänning...........................................................7
Statisk elektricitet........................................7
Synonymer...................................................7
Volta.............................................................7
Resistans...........................................................8
Synonymer...................................................8
Symbol.........................................................8
Ohm.............................................................8
Effekt................................................................9
James Watt...................................................9
Matte 1 – Ekvationer............................................10
Ekvationer.......................................................10
Formelräkning.................................................11
Ellära...................................................................12
Ohms lag.........................................................12
Effektlagen.................................................12
Matte 2 -Potenser.................................................14
Prefix...............................................................14
Potenser..........................................................14
Räkna med potenser..................................15
Addition och subtraktion............................15
Multiplikation och division.........................15
Talsystem..............................................15
Konversioner..............................................15
Elläran fortsätter............................................16
Symboler....................................................16
Seriekretsar...............................................16
Parallellkretsar...........................................17
Kombinationer............................................18
Batterier – potentialer................................18
EMK......................................................18
Inre resistans........................................18
Polspänning...........................................18
Schemaläsning................................................19
Matte 3 - Bra sätt att svara..................................20
Bråkform.........................................................20
Decimal form...................................................20
Heltal..............................................................20
Närmevärde....................................................20
Gällande siffror...............................................20
Avrundning.....................................................20
Enhet..............................................................21
Formalia..........................................................21
Del 2 - Mer grunder.............................................22
Ledare.............................................................22
Ledningsresistans......................................22
Komponenter..................................................23
Resistorer...................................................23
Toleranser.............................................23
Märkning...............................................24
Problem.................................................24
E-serien.................................................25
Dioder........................................................26
Uppbyggnad..........................................26
iii
Typer.....................................................26
Diodens baksidor...................................28
Kondensatorer............................................29
Uppbyggnad..........................................29
Serie vs parallell...................................29
Typer.....................................................30
Baksidan................................................30
ESR. ..........................................................30
Spolar.........................................................31
Högerhandsregeln.....................................31
Transformatorer (något lite magnetism)....31
Strömkällor (en liten blänkare om hushållsel
och lite säkerhet).......................................32
Inre resistans (impedans, bara nämna)......32
Mer effekt.......................................................32
(Blanda stora och små siffror, betydelsen av
potenser)....................................................32
Matte 4 – Substitution..........................................34
Mixa formler...................................................34
Elsäkerhet............................................................36
Ledare och isolatorer......................................36
Uppbyggnad...............................................36
Motståndstråd............................................36
Supraledare................................................36
Säkringar........................................................36
Jordning..........................................................37
Jordfelsbrytare................................................37
Motorskydd.....................................................37
Transienter.....................................................37
Gnistsläckning................................................37
Ljusbågar (säkringsbyte, svetsning)...............37
Extra isolering FI............................................37
Isolationsavstånd (kopparbanor på mönsterkort
(kretskort))......................................................38
Emaljerad koppartråd (lindningar i motorer)
(genomslag, temperaturtålighet)....................38
Skyddsklasser.................................................38
Starkström......................................................39
Högspänning...................................................39
Del 3 - Mätteknik.................................................40
Instrument och storheter................................40
Delarna......................................................40
Användningen............................................40
Avläsning...............................................41
Ideala egenskaper...........................................41
Mäta ström (shunt)....................................41
Mäta spänning (förkoppling)......................42
Resistans....................................................42
Onoggrannhet.................................................42
kapacitans, induktans omnämns, visas
(kommer i "Växelström")............................42
Dioder (bryggor) (tyristorer och triacar
omnämns, visas i funktion, kommer i
"Elektronik" och "Kraftelektronik")............42
Vridspole....................................................42
Vridjärn (kan visa effektivvärde)................42
Digitala metoder........................................42
Mätfel / kompensation................................42
Orsaker till fel............................................42