vzorce

Question 1

merny odpor R sa rovna

Answer 1

R = ϱ x (l/S)

Question 2

merny odpor ϱ sa rovna

Answer 2

ϱ = (R x S) / l

Question 3

merny odpor l sa rovna

Answer 3

l = (R x S) / ϱ

Question 4

merny odpor s sa rovna

Answer 4

S = (ϱ x l) / R

Question 5

aku znacku ma prudova hustota

Answer 5

J

Question 6

aku zakl. jednotku ma prudova hustota

Answer 6

A x mm(-2)

Question 7

aku znacku ma intenzita prudoveho pola

Answer 7

E

Question 8

aku zakl. jednotku ma intenzita prudoveho pola

Answer 8

V x m(-1)

Question 9

aku znacku ma el. vodivost

Answer 9

G

Question 10

aku zakl. jednotku ma el. vodivost

Answer 10

(S)iemens

Question 11

ako vypocitam el. vodivost s G a R

Answer 11

G = 1/R, R = 1/G, G = I/U

Question 12

ako vypocitam intezitu prud. pola

Answer 12

E= U / l

Question 13

ako vypocitam prudovu hustotu

Answer 13

J = I / S

Question 14

aka je zakladna jednotka merneho odporu

Answer 14

Ω x mm(2) x m(-1)

Question 15

co vyjadruje W

Answer 15

pracu, spotrebu energie

Question 16

co vyjadruje P

Answer 16

vykon

Question 17

aky je vzorec na vypocet W

Answer 17

W = U x I x t, W = P x t

Question 18

aky je vzorec na vypocet P

Answer 18

P = W / t = (U x I x t) / t = U x I

Question 19

ake vzorce viem pouzit pri praci a vykone ak poznam I a R

Answer 19

U = R x I, P = R x I(2), W = R x I(2) x t

Question 20

ake vzorce viem pouzit pri praci a vykone ak poznam U a R

Answer 20

I = U/R, P = (U(2)) / R, W = (U(2)) / R x t

Question 21

ake je oznacenie ucinnosti el. zariadeni

Answer 21

theta

Question 22

pomenuj P1, P2 a deltaP

Answer 22

P1 - prikon, P2 - vykon, deltaP - straty

Question 23

ako vypocitam P1

Answer 23

U x I

Question 24

ako vypocitam thetu

Answer 24

P2/P1 a v percentach (P2/P1)x100