Điện áp xoay chiều giữa hai đầu đoạn mạch được cho bởi biểu thức sau: u = 120cos(100πt + π/6) V. Dòng điện qua mạch khi đó có biểu thức i = cos(100πt – π/6) A. Tính công suất tiêu thụ của đoạn mạch?

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  I usually have a big birthday party unless _____________ .
  
  

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

  Ice always melts if the air temperature will be warm enough.

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

  Were we to run our own business, we would have been more independent.

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

  I would have saved some food for you if I knew you were going to be late.

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

  Should Tom help us, the job would only take half an hour.

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

  If you slept  better last night, you wouldn’t be so tired now.

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

  I think you should revise for the exam.
  
  

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

  You can’t make a cake without flour.
  
  

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

  The house didn’t burn down because the fire brigade came immediately.
  
  

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

  If I had been watching the road, I wouldn’t have had an accident.