rated impedance

例句：

1. 1. The electrical system has a rated impedance of 50 ohms.
   这个电气系统的额定阻抗是50欧姆。
2. 2. The circuit has a high rated impedance, which can cause the signal to be attenuated.
   电路的额定阻抗很高，这会导致信号衰减。
3. 3. The power supply has a low rated impedance, which allows for efficient power transfer.
   电源的额定阻抗很低，这使得电力传输效率很高。