某高温高压蒸汽消毒锅的简化电路图如如图所示．其中A是温度表（_爱下问搜题

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问题计算题

某高温高压蒸汽消毒锅的简化电路图如如图所示．其中A是温度表（可等效为一只电流表），用来指示锅内的温度；R₀为5 Ω的定值电阻；R_x为热敏电阻，用来探测锅内的温度，其阻值与温度的关系如下表．

试求：

（1）当锅内温度为80℃时，电路中的电流是0.24A．则电源电压是多少？

（2）当锅内温度为110℃时，电路中的电流是多少？热敏电阻R_x的电功率是多少？

答案

（1）当锅内温度为80℃时，R_x接入电路的电阻为20Ω，

R=R₀+R_x=20Ω+5Ω=25Ω，U=IR=0.24A×25Ω=6V；

（2）当锅内温度为110℃时，R_x接入电路的电阻为10Ω，R=R₀+R_x=10Ω+5Ω=15Ω，

I=，P_x=I²R_x=（0.4A）²×10Ω=1.6W

问答题

Internal environment：

完形填空

One day, when I was in high school, I saw a kid named Kyle from my class walking home from school with all his books. I thought to myself, “ 36 would anyone bring home all his books for the weekend? He must really be 37 .”
As I was walking, I saw several kids running toward him. They ran at him, 38 all his books out of his arms and he fell down in the dirt. His glasses went 39 and landed in the grass.
My 40 went out to him. So, I ran over to him. 41 I handed him his glasses, he looked at me and said, “Hey, thanks!”
I helped him pick up his books, and asked him where he lived. As it 42 , he lived near me. We talked all the way home. Over the next four years, Kyle and I became best friends.
Kyle was the 43 student of our class, one of those guys that really found 44 during high school. Therefore he had the honor to prepare a 45 speech. On the graduation day, I could see that he was 46 . So, I patted him on the back and said, “Hey, big guy, you’ll be 47 !” He looked at me and smiled.
He cleared his throat, and began. “Graduation is a time to 48 those who helped you make it through those 49 years. Your parents, your teachers…but mostly your friends. I am here to tell all of you that being a friend to someone is the best 50 you can give him.”
I just looked at my friend with 51 as he told the story of the first day we met. He had planned to 52 himself over the weekend and was carrying his books home. “Thankfully, nothing happened. My friend 53 me from doing the unspeakable(不能说出来的).”
Not until that moment did I realize that you should never underestimate(低估) the 54 of your actions. With one small gesture you can 55 a person’s life. For better or for worse.

D．congratulate