如图所示的电路,R1=R2,当开关S断开时,电流表的示数是1A,开关S闭合时,电流表的示数将()
A 不变 B 增大到2A C 减小到0.5A d 增大到4A
图是R1,R2并联,电流表在R1所在支路上
人气:270 ℃ 时间:2019-08-25 04:13:27
解答
A 并联电路互不影响
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