【单选题】he input power to a device is 5000 W at 400 V. The output power of the device is 750 W, and the output impedance is 25 Ω. Calculate the voltage gain in decibels.
【单选题】The input power to a device is 5000 W at 400 V. The output power of the device is 750 W, and the output impedance is 25 Ω. Calculate the voltage gain in decibels. ( )