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已知如图所示，R₁=3Ω，R₂=6Ω，R₃=6Ω，R₄=12Ω，Uₛ=15V，则电流I为( ):
（含图）

正弦交流电的有效值等于最大值的( )。

我们把提供电能的装置叫做( )。

电阻元件是( )元件。

在一恒压的电路中，电阻R增大。电流随之( )。

参考点也叫零点位点它是由( )的。

导体电阻先接在220V的电源上，后接在110V的电源上，要使其前后功率不变，问电阻应怎样变化( )。

支路电流法是以( )为求解对象。

电容器中储存的能量是( )。

1安培等于( )微安。

交流测量仪表所指示的读数是正弦量的( )。

一个实际电源的电压随着负载电流的减小将( )。

当电容器并联时，其效果相当于增大了两个极板的面积，从而使总电容量( )。

正弦交流电的有效值等于最大值的( )。

电感在直流电路中相当于( )。

以下哪一个是基尔霍夫定律( ) 。

电路由( )和开关四部分组成。

人体电阻是3000-4000Ω，流过人体的电流是5mA,问人体电压不能大于( )。

电路中两节点间的电压高，说明( )。

1安培等于( )毫安。

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