苏科版《15-4家庭电路与安全用电》pptflash课件.ppt

一、家庭电路的组成 * 15.4家庭电路与安全用电 响水县实验初级中学 吉园园 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. .. 。 。 。 220V 火线 零线 电能表 熔丝 闸刀开关 两孔插座 电灯 开关 家庭电路电路图 。 。 。 地线 .. . 三孔插座 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 进户线：一根是火线 一根是零线 家庭电路中，火线与零线之间的电压是220V 地线——与大地相连接的一根线，叫地线。 正常情况下， 零线与地线之间的电压为0V 火线与地线之间的电压为220V Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 活动 　观察三线插头与三线插座 三线插头 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 三线插座 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 三线插座是怎样 接入电路中的呢？ 零线 火线 地线 左零右火 中接地 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 火线 零线 地线 零线 火线 地线 左零右火 中接地 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 火线 零线 地线 零线 火线 左零右火 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 测电笔各部分作用是什么？ 活动 ：练习使用测电笔 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 手一定要接触电笔尾部的金属电极，绝不允许接触笔尖金属。 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 安全用电主要包括： 设备安全 人身安全 在家庭电路中，为了保护家庭电路和设备， 防止因电路过热损坏家庭电路或引发火灾， 采取了哪些措施？ 想一想 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 怎样预防用电设备因电流 的热