※ 引述《Sron (沒暱稱)》之銘言：
: 之前讀高職學校沒電學的課程..
: 希望板上有人可以995QAQ
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: 43,49,54,70
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: 附上算式每題第一位一題500p
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<54 解答>
由 P = V * V / R
=> 270W = 48V * 48V / R
=> R = 8.53 Ω
又 R = ((R1串聯R2)並聯R3)串聯R4
R1 串聯 R2 => 3.7Ω+3.7Ω=7.4Ω
再並聯 R3 => (7.4*R3)/(7.4+R3)
再串聯 R4 => 4 + (7.4*R3)/(7.4+R3) = R = 8.53
得到 R3 = 11.70 Ω