electricitate

Question 1

sarcina electrica elementara

Answer 1

1,6x10^-19 coulombi

Question 2

sarcina electrica

Answer 2

Q=N x e

Question 3

legea lui coulomb

Answer 3

F1=F2=k x (q1 x q2)/r^2

Question 4

constanta k din legea lui coulomb

Answer 4

1/4pi E0

Question 5

permitivitate electrica

Answer 5

farad/metru

Question 6

Diferența de potential

Answer 6

LCamp MlaN/q

Question 7

Volt

Answer 7

J/C

Question 8

Intensitatea

Answer 8

Delta q/delta t

Question 9

Coulomb

Answer 9

Amper x secunda

Question 10

Densitatea de curent

Answer 10

J = n x vd x e

Question 11

Rezistenta electica

Answer 11

Rezistivitate x l/s

Question 12

variatia temperaturii cu rezistivitatea sau rezistenta

Answer 12

rez2=rez1(1+alfa x delta T)

Question 13

legea lui ohm pe o portiune

Answer 13

U=IR

Question 14

ohm

Answer 14

volt/amper

Question 15

bilantul tensiunilor

Answer 15

E=U+u

Question 16

legea lui ohm pe un circuit simplu

Answer 16

I=E/R+r

Question 17

intensitatea scurtcircuit

Answer 17

E/r

Question 18

nr de ochiuri pentru care se pot scrie ecuatii

Answer 18

L-N+1

Question 19

gruparea rezistentelor in paralel

Answer 19

1/Rp=1/R1+1/R2….

Question 20

gruparea surselor in serie cu borne orientate diferit

Answer 20

Es=E1-E2
rs=r1+r2

Question 21

gruparea surselor in paralel

Answer 21

Ep/rp=E1/r1+E2/r2
(cu minus daca bornele sunt orientate diferit)

Question 22

rezistenta sunt ampermetru

Answer 22

Ra/n-1 unde n=I/Ia

Question 23

rezistenta aditionala voltmetru

Answer 23

Rv(n-1) unde n=U/Uv

Question 24

puntea wheatstone

Answer 24

R1 x R3=R2 x R4

Question 25

caldura degajata de curent

Answer 25

I^2RT UIT U^2/R x t

Question 26

Energia electrica

Answer 26

E x I x delta t

Question 27

puterea pe o rezistenta

Answer 27

U^2/R U x I R x I^2 W/delta t

Question 28

watt

Answer 28

J/s

Question 29

kwh in jouli

Answer 29

3,6 x 10^6

Question 30

puterea degajata de baterie

Answer 30

E^2/Re+r E x I

Question 31

randamentul transferului optim de putere

Answer 31

R/Re+r U/E 1/(1+r/R)

Question 32

transferul optim de putere

Answer 32

E^2 R/R+r

Question 33

puterea utila maxima

Answer 33

E^2/4r

Question 34

montarea pe rand a unei rezistente mai mici si a uneia mai mare decat rezistenta interna

Answer 34

r= rad(R1x R2)

Question 35

randamentul de conversie

Answer 35

m x lamda/Uit

Question 36

U de mers in gol

Answer 36

U=E

Question 37

gruparea surselor identice in paralel

Answer 37

Ep=E