Объяснение:
R = R1 + R(2,3,4) + R5
1/R(2,3,4) = 1/R2 + 1/R3 + 1/R4
R(2,3,4) = (R2×R3×R4) ÷ (R2×R3 + R3×R4 + R2×R4)
R(2,3,4) = (5×10×30) ÷ (5×10 + 10×30 + 5×30) = 1500 ÷ (50 + 300 + 150) = 1500 ÷ 500 = 3 Ом.
R = 4+3+3 = 10 Ом.
I = U ÷ R
I = 40 ÷ 10 = 4 A.
Ответ: 10 Ом; 4 А.
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Answers & Comments
Объяснение:
R = R1 + R(2,3,4) + R5
1/R(2,3,4) = 1/R2 + 1/R3 + 1/R4
R(2,3,4) = (R2×R3×R4) ÷ (R2×R3 + R3×R4 + R2×R4)
R(2,3,4) = (5×10×30) ÷ (5×10 + 10×30 + 5×30) = 1500 ÷ (50 + 300 + 150) = 1500 ÷ 500 = 3 Ом.
R = 4+3+3 = 10 Ом.
I = U ÷ R
I = 40 ÷ 10 = 4 A.
Ответ: 10 Ом; 4 А.