【简答题】单相桥式整流、滤波电路如图18-29所示,已知变压器副边电压有效值U 2 =20V,负载电阻R L =80Ω,今测得负载电压为以下几种:(1)输出电压为20V;(2)输出电压为9V;(3)输出电压为24V;(4)输出电压为18V;(5)输出电压为28V。试分析电路是否为正常工作,若不正常工作分析其原因。
【单选题】Transportation in the U.S. Railroads are paths of parallel metal rails that allow a wheeled vehicle to move more easily by reducing friction. Iron mils were first used in the early 1800s to guide hors...