Cho mạch điện RLC. Điện áp đặt vào 2 đầu đoạn mạch có dạng u = Ucos(ωt); R₂ = . Cho biết điện áp hiệu dụng U_RL = U_RC. Hệ số công suất đoạn mạch bằng:

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  You ___________ life much easier if you smile more often.
  
  

• Choose the best answer for the following sentence:

  If you ____________ as I told you, you would have succeeded.
  
  

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

  box                    hospital                      local                        shop 

• Choose the word whose stress is on the third syllable:

  picturesque                     industrial                     paragraph                      Internet

• Choose the best answer for the following sentence:

  Our house is right in the country. There are plenty of nice places to walk in the _____ area.
  
  

• Choose the best answer for the following sentence:

  It wasn’t I who stole the jewels. You’ve made a ___________ mistake.
  
  

• Choose the best answer for the following sentence:

  I couldn’t decide between the two records, so I bought ____________ of them.
  
  

• Choose the best answer for the following sentence:

  Have you told ____________ about the letter?
  
  

• Choose the best answer for the following sentence:

  I would never borrow money from ____________ .
  
  

• Choose the best answer for the following sentence:

  The boy said that he hadn’t done ____________ wrong.