Một đoạn mạch điện gồm một điện trở R, một cuộn thuần cảm L và một tụ điện C ghép nối tiếp nhau, điện áp giữa hai đầu đoạn mạch là u = Ucosωt, có các giá trị hiệu dụng U_R = 80V, U_L = 120V, U_C = 60V. Giá trị U bằng:         

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Một số câu hỏi khác có thể bạn quan tâm.

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

  chart              postcard                  leopard                   hardly

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

  camel                 sandy                   travel                    stable

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

  dune               hummock                    shrubland                   gun

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

  basic                  desert                    president                     season

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

  separate                  network                    dessert                  crest

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

  stretches                slopes                  ranges                  faces

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

  There/ no substitute/ hard work/ if/ want/ succeed.
  
  

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

  In/ hands/ reckless driver/ car/ becomes/ lethal weapon.
  
  

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

  After/ robbery/ shop/ installed/ alarm system/ as insurance/ further losses.
  
  

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

  Given/ difficulty / task / I / lucky / complete/ by May.