Cho mạch điện xoay chiều RLC. Biết điện áp hiệu dụng giừa hai đầu đoạn mạch là 15 V, giữa hai đầu cuộn dây thuần cảm là 25 V, giừa hai đầu tụ điện và điện trở thuần là 20 V. Vậy hệ số công suất của mạch là 

Chia sẻ

Một số câu hỏi khác có thể bạn quan tâm.

• Find a mistake in the four underlined parts of the sentence and correct it:

  Much as though I approve of his enthusiasm, I’m worried he’ll overdo his weight training.

• Choose one sentence that has the same meaning as the root one:

  I'm sure I told him to stay at home, but he’s gone out.
  
  

• Choose one sentence that has the same meaning as the root one:

  John did well in the competition, but he didn’t win.
  
  

• Choose one sentence that has the same meaning as the root one:

  Brave though he was, the soldier dreaded the onset of battle.
  
  

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

  future                     computer                       shuttle                        nuclear 

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

  world                   sports                          morning                       corporation

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

  threaten                       methane                       earth                       breathing

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

  spacecraft                        astronaut                      happen                      factor

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

  bound                       touch                     without                  aloud 

• Choose a word that has different stress pattern:

  robot                expect                        burden                           instance