1

i = dqdt q = ∫ i dt i = ∫ J·dA = JA vd = inAe = Jne

2

R = Vi ρ = EJ R = ρLA ρ − ρ0 = ρ0α(T − T0)

3

ρ = me2nτ

4

ℰ = dWdq ℰ − ir − iR = 0 i = ℰR + r P = iV = i2R = V2R

5

: Req = Σ Rj : 1Req = Σ 1Rj

6

: Σiin = Σiout : ΣΔV = 0

i1 = ℰ1(R2+R3) − ℰ2R3D,  i2 = ℰ1R3 − ℰ2(R1+R3)D,  i3 = −ℰ1R2 − ℰ2R1D
D = R1R2 + R1R3 + R2R3