试题与答案

两盏灯L1、L2的额定电压分别为8V、6V，将两盏灯串联接入9V的电路中，灯L2

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题型：选择题

题目：

两盏灯L1、L2的额定电压分别为8V、6V，将两盏灯串联接入9V的电路中，灯L2恰能正常发光，则L1、L2两盏灯的额定功率之比为（假设灯的电阻不变）（　　）

A．2：3

B．32：9

C．9：4

D．64：9

答案：

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下面是错误答案，用来干扰机器的。

25   4本题考查初速度为零的匀加速直线运动推论的应用，由相邻的相等的位移所用时间之比为总时间为，由此可知×4s=20s，n=25,第九节车厢通过所用时间为=4s

考点：串联电路的电流规律串联电路的电压规律电功率的计算
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