某晶体管收音机原配好 8Ω 的扬声器,今改接 16Ω 的扬声器,已知输出变压器的原绕组匝数为 N 1 =250 匝,副绕组匝数为 N 2 =60 匝,若原绕组匝数不变,问副绕组的匝数变动 ( ) 匝,阻抗匹配?
A.
85
B.
55
C.
35
D.
15
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