问题
多选题
如图所示,一电压表和可变电阻器R串联后接在一个电压恒定的电源两端,如果可变电阻的阻值减小到原来的![]() A.流过R的电流将增大到原来的2倍 B.R两端的电压将减来原来的 C.R上消耗的功率将变为原来的 D.当R阻值变为零时,电压表示数将增大到3U ![]() |
答案
ABD
如图所示,一电压表和可变电阻器R串联后接在一个电压恒定的电源两端,如果可变电阻的阻值减小到原来的![]() A.流过R的电流将增大到原来的2倍 B.R两端的电压将减来原来的 C.R上消耗的功率将变为原来的 D.当R阻值变为零时,电压表示数将增大到3U ![]() |
ABD
、阅读对话,完成题。(共5小题,每小题1分,满分5分)
B: Glad to meet you, too. A: ______________________小题1: B: I’ve been in Britain and studying English there. A: ________________________小题2: B: It’s nice. It has only 200 students. A: That is very small. Isn’t very young? B: Yes, it is less than 3 years old. A: _______________________小题3: B: Yes, at first I couldn’t understand what others said and________________小题4: A: Oh, then ___________________小题5: B: At 9:00. |