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[单选题]
单相桥式整流电容滤波电路中，设变压器副边电压有效值为10V，若滤波电容和某个二极管同时开路，则负载电阻上电压为（）
A
10V
B
9V
C
4.5V
D
12V
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参考答案
试题答案：
C
答案解释：
二极管断开相当于半波整流了，输出电压就是副边的0.45倍。根据这样的理论分析，所以本题选择C。
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