Mạng điện ba pha hình sao có điện áp pha =220(V) có ba tải tiêu thụ mắc vào mạch theo kiểu hình sao. Ba tải là 3 điện trở thuần có giá trị lần lượt là . Cường độ hiệu dụng của dòng điện trong dây trung hòa là:  

Chia sẻ

Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  There ___________ mutual understanding between friends.
  
  
  

• Choose the word that has the underlined part pronounced differently from the rest:

  machinery                 march                    cheerfully                  merchant

• Choose the best answer for the following sentence:

  The water was so polluted that the explorers could not drink it.

• Choose the best answer for the following sentence:

  His doctor advised him ____________, but he found it impossible ______________ his habit.
   

• Choose the best answer for the following sentence:

  Their company was made ___________ 100,000 USD in taxes.
   

• Choose the best answer for the following sentence:

  The Pikes has a painter ______________ all the windows of their house.
  
  

• Choose the best answer for the following sentence:

  They did not let us _____________ the lecture because we had not got a member card.
   

• Choose the best answer for the following sentence:

  He had spent ______________ that he was broke.
   

• Choose the correct sentence which is built from the words and phrases given:

  he / twenty
   

• Choose a word that has different stress pattern:

  video               exactly                  carefully                  serious