※ 引述《Sron (没暱称)》之铭言：
: 之前读高职学校没电学的课程..
: 希望板上有人可以995QAQ
: https://i.imgur.com/kEPI9vz.jpg
: https://i.imgur.com/L2LwzPy.jpg
: https://i.imgur.com/FOlPCJX.jpg
: https://i.imgur.com/9AokUd5.jpg
: 43,49,54,70
: 拜托各位了呜呜呜
: 附上算式每题第一位一题500p
: 感谢大家协助
<54 解答>
由 P = V * V / R
=> 270W = 48V * 48V / R
=> R = 8.53 Ω
又 R = ((R1串联R2)并联R3)串联R4
R1 串联 R2 => 3.7Ω+3.7Ω=7.4Ω
再并联 R3 => (7.4*R3)/(7.4+R3)
再串联 R4 => 4 + (7.4*R3)/(7.4+R3) = R = 8.53
得到 R3 = 11.70 Ω