图示正弦电流电路中电压u(t)的振幅等于( ) 。
·1V
·4V
·10V
·20V<img src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/examination/imgUplod/16337615113582b9de151c42a4487a5c76d82bdb4486eimage11.png"
出自:西南石油大学土木工程施工与组织(专升本)