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问题 问答题

某电路两端的电压为12V且保持不变，若通过电路的电流为1.5A时，电路中的电阻为多少？若使电路中的电流减少到0.5A，则应再串联一个多大阻值的电阻？

答案

（1）R=

U
I
=
12V
1.5A
=8Ω；

答：电路中的电阻为8Ω．

（2）R总=

U
I总
=
12V
0.5A
=24Ω，

R串=R总-R=24Ω-8Ω=16Ω．

答：应再串联一个阻值为的16Ω的电阻．

单项选择题

价值活动中通过分析某种费用或资源对企业的某个技术经济指标的影响程度的大小，来选择价值工程对象的方法称为( )。

A．因素分析法
B．百分比分析法
C．强制确定法
D．ABC分析法
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改错题

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Dear Michelle,

     I'm very exciting!Today is my first day at a new school in Australia.The school I study at is a

government school.Although I'm new to my classmates,the teacher asks me to introduce me to them is

class.I tell them I come from Hong Kong and I like to play with computer games,listen to music and do

ports in  my spare time.I also like the Australia way of life.Australia is big country.The shopping malls are

big.There are mainly six public library and museums in Sydney.Just a few minutes' walk from which I live,

there is a huge park.Around my house,there is plenty of space.

     Michelle,I miss you very much.I'll never forget the days we spend together and the fun we shared all

our old classmates.

     Best wishes.

                                                                                                                                                  Yours,

                                                                                                                                                  Josphine

________________________________________________________________________________
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