“15-2电流做功的快慢”第2课时ppt演示课件.ppt

第二课时：额定功率和实际功率 沪科版新教材同步教学课件 第十五章　从测算家庭 电费说起 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. 知识梳理 1、电功表示 ，表达式 ，单位 电流做功的多少 W=UIT或W=Pt J和KW·h 2、电功率表示 ，它是电流在 内做的功，表达式 ，单位 电流做功的快慢 单位时间 P=W∕t或P=UI W、KW、MW 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. 对推导式的正确理解 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. 例： ? 灯L1和L2的电阻关系是R1R2，将它们串联在电路中，则两灯的电压关系是U1___U2,两灯消耗的电功率关系是P1__P2.若将它们并联在电路中，两灯的电流关系I1__I2,电功率关系又是P1__P2。 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. 分析过程 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. 1.额定电压和额定功率： 额定电压：指用电器正常工作的电压； 额定功率：指用电器在额定电压下工作的 功率,或者说正常工作的功率。 2.实际电压和实际功率 实际电压：用电器实际工作的电压； 实际功率：用电器在实际电压下工作的功率 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. Evaluation only. Created with Aspose.Slides for .NET 3