关掉电源怎么说英语

To turn off the power in English, you can say "shut off the power" or "turn off the power." You can also say "power off" or "cut the power." For example:
Can you please shut off the power to the computer?
I need to turn off the power to the printer before I unplug it.
Can you power off the TV before you go to bed?
I need to cut the power to the garage door opener before I do any repairs.
I hope this helps! Let me know if you have any other questions.