Energie et potentiel Flashcards

1
Q

La puissance

A

P = W / T = F.v = dW/dt (en Watt)

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2
Q

Le travail

A

W = P x T = F.AB = F.dl = F.dl.cos0 (en Joule)
W<0 résistant
W>0 moteur

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3
Q

Energie cinétique

A

1/2 mv^2 (en Joule)

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4
Q

Energie pesanteur

A

mgz (en Joule)

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5
Q

Vitesse

A

Vf = racine(Vi^2 + 2gh)

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6
Q

Moment dipolaire

A

de -q vers +q

IIpII = q x a

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7
Q

Potentiel

A

V(M) = p.u/4πЄor^2

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8
Q

Densité surfacique de charge

A

σ = Q/S

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9
Q

Champs électrique d’une plaque chargée

A

E = σ/2Єo

uniforme de part et d’autre de la plaque

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10
Q

Condensateur

A

de +σ vers -σ

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11
Q

Champs électrique d’un condensateur

A

E = σ/Єo
uniforme entre les plaques
nul à l’extérieur

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12
Q

La capacité

A

C = Q/ΔV (en Farad)

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13
Q

Différence de potentiel entre les armatures

A

ΔV=V(h)-V(o)= -σh/Єo

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14
Q

Energie potentielle stockée dans un condensateur plan

A

E = Q^2 / 2C = 1/2CΔV^2

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