問題詳情
21.( )某電熱器的電阻線拆下，均勻的拉長為原來 倍後，剪掉到與原長度一樣接回此電熱器，若仍接於同一電源使用，則其發熱功率變為原來的若干倍？
(A)
(B)
(C)
(D)
(E)
。
(A)
(B)
(C)
(D)
(E)
。
參考答案
答案：C[無官方正解]
難度：適中0.5
統計：A(0),B(2),C(2),D(1),E(0)
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