试题与答案

如图所示的电路中,电源电动势为10V,电源内阻r=1Ω,R1= 3Ω.R 2=

题型:计算题

题目:

如图所示的电路中,电源电动势为10V,电源内阻r=1Ω,R1= 3Ω.R 2= 6Ω.

电容C=30μF. 求:

(1)闭合开关S,稳定后通过电阻R1的电流;

(2)开关S断开后,通过R1的电荷量.

答案:

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题型:单项选择题

A Trip to the Forest


One day Bob took two of his friends into the mountains. They put up their tents and then rode off to a forest to see how the trees were growing.
In the afternoon when they were about ten kilometres from their camp, it started to snow. More and more snow fell. Soon Bob could hardly see his hands before his face. He could not find the road. Bob knew there were two roads. One road went to the camp, and the other went to his house. But all was white snow. Everything was the same. How could he take his friends back to the camp
Bob had an idea. The horses ! Let the horses take them back ! But what would happen if the horses took the road to his house That would be a trip of thirty-five kilometres in such cold weather!
It was getting late. They rode on and on. At last the horses stopped. Where were they None of them could tell. John looked around. What was that under the tree It was one of their tents!

John and his two friends went to the forest to ______.

A.build their camp

B.find their way home

C.enjoy the mountains in the snow

D.watch the trees in the forest

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