串並聯電路的總電阻:
r = R2×R4/(R2+R4)+r 1 = 2×4/(2+4)+2≈3.33(ω)
1 "r1電流:
I=U/R=6/3.33≈1.8(A)
r1的2”電功率:
p = I×I×R = 1.8×1.8×2 = 6.48(W)
3”電流流動方向: