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.
Please turn on the laptop's power.
If this machine loses power, the data will be lost.
power button; power switch
Specifically the button or switch that controls power on a device like a TV, computer, or game console.
I pressed the TV's power button, but it won't turn on.
Please shut down the computer's power when you finish working.
The power in the house cut out because of a blackout.
Please connect this cable to a power source.
The TV won't turn on even when I press the power button.
redundant power supply
external power source; external power supply