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 <span class="TitlePageSM">第18章 (电功率) 第3节 测量小灯泡的电功率</span> </center>
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 <BR>&nbsp;&nbsp;&nbsp;&nbsp;在这个实验中，我们将用滑动变阻器控制电路，
 分别测量以下三种情况下小灯泡的实际功率。
  <BR>&nbsp;&nbsp;&nbsp;&nbsp;（1）使小灯泡两端的电压等于额定电压，观察小灯泡的亮度，测量它的电功率，这是它的额定功率。
  <BR>&nbsp;&nbsp;&nbsp;&nbsp;（2）使小灯泡两端的电压低于额定电压，观察小灯泡的亮度，测量它实际的电功率。
  <BR>&nbsp;&nbsp;&nbsp;&nbsp;（3）使小灯泡两端的电压约为额定电压（标在灯口上）的1.2倍，观察小灯泡的亮度，测量它实际的电功率。
 
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<hr>  <font size=5 color=blue><b>参考资料：</b></font>
  
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人教版九年级物理全册18.2节《测量小灯泡的电功率》微课视频+知识点+课时练习
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