题目

NameTopicMikeI don't like to have classes at weekends，but my mother says it helps me study better.Do you have the same problem(问题)？KateI like playing the piano.But my parents let me do it for two hours every day.It's a long time you know，so now I begin to hate(讨厌)it.JoeMy teacher teaches us to use a computer.I think it is good for us to study and do our homework on the Internet.I hope every student can study on the Internet.MattEvery day after work I go on the Internet.It's a good way to have a rest.I usually listen to music and watch movies.It's really fun. 【1】Mike's mother如图所示，电源两端电压保持12V不变，小灯泡L上标有“6V  3W”字样，滑动变阻器最大电阻值R=60Ω．不考虑灯丝电阻随温度的变化，下列说法正确的是（ ）A．S闭合后，使电压表的示数减少1V，小灯泡L两端的电压就增加1VB．S闭合后，小灯泡L的最小实际电功率为2WC．小灯泡L正常发光时，变阻器R消耗的电功率为6WD．开关S断开时，电压表的示数为12V