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45.如附圖所示為兩種輸出電壓規格的理想變壓器,變壓器原、副線圖匝數比為n1:n2:n3=4:3:2,副線圈上分別接規格為“6 V,l2 W"、“12 V,36 W"的燈泡L1和L2,當a、b兩端接交
問題詳情
45.如附圖所示為兩種輸出電壓規格的理想變壓器,變壓器原、副線圖匝數比為n1:n2:n3=4:3:2,副線圈上分別接規格為“6 V,l2 W"、“12 V,36 W"的燈泡L1和L2,當a、b兩端接交變電源後,讓L1、L2以正常規格發光,則變壓器的輸入功率為
(A) 16 W
(B) 40 W
(C) 48 W
(D) 72 W
(E)不能確定
參考答案
答案:[無官方正解]
難度:非常困難0
統計:A(0),B(0),C(1),D(0),E(0)
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