Part 3 Flashcards

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1
Q

Gruparea generatoarelor serie

A

Eserie = E1+E2+….+En
r serie = r1+r2+r3+…rn
Iserie = E serie/r serie + R

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2
Q

Gruparea generatoarelor in paralel

A

E paralel = E
1/r p=1/r1+ 1/r2+….+1/rn
I paralel = E/rp + R

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3
Q

Efectul termic sau efectul Joule

A

Incalzirea conductoarelor ca urmare a trecerii curentului electric prin ele se numeste efect termic sau efect Joule
ex fier de calcat, incarcator, luminte

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4
Q

Legea Joule

A

Q=I^2 * R * t

Caldura degajata este direct proportionala cu patratul intensitatii curentului electric prin conductorul cu rezistenta R in intervalul de timp t

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5
Q

Energia electrica

A

W total = W ex + W int
W total = EIt= I^2 * (R+r) * t
W ex = U * I * t= I^2 * R * t
W int = u * I *t= I^2 * r * t

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6
Q

Puterea electrica

A

P = W/t

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7
Q

In ce se masorara P

A

In watt

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8
Q

1 Kwh

A

3.6 * 10^6 Joule

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9
Q

Pt

A

P ex + P int

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10
Q

Pt formule

A

E * I = I^2 * (R+r)

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11
Q

P ex

A

U*I=I^2 * R

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12
Q

P int

A

u*I=I^2 * r

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13
Q

Transferul maxim de putere

A

Puterea furnizata de un generator electric circuitului e maxima cand R circuitului este egala cu r intern sursei si are valoarea Pmax = E^2/4r

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14
Q

Randamentul unui circuit

A

eta = W ext/W total
eta = U/E=R/r+R
eta = 50% cand puterea este maxima

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