file:10-电磁感应现象 .mp4 file:09-通电螺线管的磁极下 .mp4 file:05-安培定则 .mp4 file:26-家庭电路的短路 .mp4 file:20-电热的利用与防治.mp4 file:17-电功率的测量原理.mp4 file:16-实际功率.mp4 file:18-并联电路的分流原理-下 .mp4 file:13-测小灯泡的电阻 .mp4 file:29-基尔霍夫电压定律下 .mp4 file:08-电路图和实物图转化.mp4