Khi đặt hiệu điện thế không đổi 30V vào hai đầu đoạn mạch gồm điện trở thuần mắc nối tiếp với cuộn cảm thuần có độ tự cảm (H) thì dòng điện trong đoạn mạch là dòng điện một chiều có cường độ 1 (A). Nếu đặt vào hai đầu đoạn mạch này điện áp  (V) thì biểu thức của cường độ dòng điện trong đoạn mạch là ?         

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose the best answer for the following sentence:

  Although it was snowy very hard, ____________.
  
  

• Choose the best answer for the following sentence:

  _______________ as I would only make it worse.
  
  

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

  I am wearing three pullovers in winter because I always feel cold.

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

  If you slept under a mosquito net you weren’t bitten so often.

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

  It is high time he has told to stop behaving like a child.

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

  The mother asked the little boy whether he was sorry for what he has done.

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

  You would have seen my garden at its best if you were here last week.

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

  The police have not investigated the theft yet.
  
  

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

  “Where were you last night, Mr. Jenkins?” he said.
  
  

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

  I didn’t notice him. That’s why I didn’t say hello.