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    14.素養(4)
1 某直徑為 1.6mm 單心線的配線迴路,其線路電壓降為 3%,若將導線換成相同材質的 2.0mm 單心線後,其線路電壓降為多少?
A 0.96%
B 1.92%
C 3.84%
D 6.8%

線路電壓降與線路電阻成正比

3%:X = ρ 𝓁1.62 : ρ 𝓁22

3%:X = 11.6 × 1.6 : 14 (交叉相乘)

3%:X = 4 : 1.6 × 1.6

3%:X = 1 : 0.4 × 1.6

X = 3% × 0.4 × 1.6 = 1.92%