noun
power supply; source of electricity; electrical power
Refers to the source or supply of electricity, such as a battery, outlet, or power line. Often used in contexts like turning power on/off or connecting a device to power.
ノートパソコンの電源を入れてください。
Please turn on the laptop's power.
この機械は電源が切れるとデータ
If this machine loses power, the data will be lost.
noun
power button; power switch
Specifically the button or switch that controls power on a device like a TV, computer, or game console.
テレビの電源を押してもつかない。
I pressed the TV's power button, but it won't turn on.