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测量小灯泡的额定功率是中考热点,出现的频率非常高,它几乎涉及到所有的电学知识,甚至热学知识,该考点知识容量大,灵活多变,对学生的分析解决问题的能力要求较高,应引起足够的重视.例1在测定“小灯泡额定功率”的实验中,电源电压为6 V,小灯泡额定电压为2.5 V、电阻约为10Ω.(1)请你用笔画线代替导线,将图1中的实物电路连接完整.(2)在连接电路时,有甲“10Ω,1A”、乙“20Ω,1 A”和丙“20Ω,0.2 A”三个滑动变阻器可供选择,则应该选择变阻器____连入电路,才能保证实验的顺利进行.
The measurement of small bulb rated power hot spot in the test, the frequency of occurrence is very high, it involves almost all of the electrical knowledge, and even thermal knowledge, the knowledge of the test center capacity, flexible, demanding students analyze the ability to solve problems , Should cause enough attention.Example 1 In the determination of “small bulb rated power ” experiment, the power supply voltage is 6 V, small bulb rated voltage of 2.5 V, the resistance is about 10Ω. (1) Please use the stroke line In place of the wires, the physical circuit in Figure 1 is completely connected. (2) When the circuit is connected, there are two types of circuits: A 10 A, 1A A, B 20 A, Three sliding rheostat to choose from, you should choose rheostat ____ connected to the circuit, in order to ensure the smooth running of the experiment.