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1. Một đoạn mạch gồm một điện trở thuần R mắc nối tiếp với cuộn cảm L biết điện áp dụng ở hai đầu điện trở r là Ur = 40 V và điện áp hiệu dụng ở hai đầu cuộn cảm Ul = 30 V thì điện áp hiệu dụng ở hai đầu đoạn mạch có giá trị là 2. Trên đoạn mạch R L C mắc nối tiếp nếu cường độ dòng điện trễ pha so với điện áp giữa hai đầu đoạn mạch thì kết luận được là
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