钳形电流表的外形和结构如图5-4-16(a)所示。图(a)中电流表的读

钳形电流表的外形和结构如图5-4-16(a)所示。图(a)中电流表的读数为1.2 A。图(b)中用同一电缆线绕了3匝,则(  )

(a)            (b)

图5-4-16

A.这种电流表能测直流电流,图(b)的读数为2.4 A

B.这种电流表能测交流电流,图(b)的读数为0.4 A

C.这种电流表能测交流电流,图(b)的读数为3.6 A

D.这种电流表既能测直流电流,又能测交流电流,图(b)的读数为3.6 A

答案

解析:本题主要考查变压器变压原理的实际应用。由题意可知,钳形电流表利用了变压器的原理,因此钳形电流表只能测交流电流,根据n1I1=n2I2,可得(b)图的读数应为3.6 A,所以C正确。

答案:C

相关题目

X、Y、Z、W四种主族元素,若X的阳离子与Y的阴离子具有相同
X、Y、Z、W四种主族元素,若X的阳离子与Y的阴离子具有相同的电子层结构;W的阳离子的氧化性强于等电荷数的X阳离子的氧化性;Z阴离子半径大于等电
某同学在实验报告中记录下列数据,其中正确的是( ) A.用25
某同学在实验报告中记录下列数据,其中正确的是( ) A.用25mL量筒量取12.36mL盐酸               B.用托盘天平称量8.75g食盐 C.用500mL的容量瓶
历史上,作为丝绸之路重要交通枢纽的楼兰古国因为树木和
历史上,作为丝绸之路重要交通枢纽的楼兰古国因为树木和水源的破坏导致生态恶化,从绿洲变成了荒漠。为了不让敦煌重演楼兰悲剧,敦煌近年来把
《韩非子》中有一个故事: “鲁人善织屦(麻等织成的单底
《韩非子》中有一个故事: “鲁人善织屦(麻等织成的单底鞋),妻善织缟,而欲徙于 越。或谓之曰;‘子必穷矣。’鲁人曰:‘何也?’曰:‘屦为
It was____computer games that cost the boy a lot of time that he ought t
It was____computer games that cost the boy a lot of time that he ought to have spent on his lessons. A.to have played B.playing C.played D.having played  
The new book Harry Potter and the Half-Blood is warmly welcomed by the children
The new book Harry Potter and the Half-Blood is warmly welcomed by the children in China. It sells well across China. You can see and hear the advertisements about the book here and there. Why is the
我国二氧化碳的排放量居世界第二位,为了对保护和改善世
我国二氧化碳的排放量居世界第二位,为了对保护和改善世界环境作出我们应有的贡献,你认为下列措施符合我国国情的是 ①调整工业布局,将高耗能
Mr. Green works in an office. One day, when he has lunch, a friend comes to see
Mr. Green works in an office. One day, when he has lunch, a friend comes to see him. They are happy and talk much. And about forty minutes later he has a look at the clock. It’s time to go to office

最新题目