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1 如圖所示之聲音放大器電路,其輸出阻抗為72Ω,喇叭的阻抗為8Ω,若欲將最大功率傳輸到喇叭上,則變壓器的匝數比N1:N2為何? 103 統測
A 9:1
B 8:1
C 3:1
D 2:1

Z1=72Ω

Z2=8Ω

Z1Z2 = (N1N2)2

728 = (N1N2)2

91 = (N1N2)2

31 = N1N2