power-up; power on
Technical computing term for the act of turning on power to a device or system.
The system starts automatically upon power-up.
電源 means 'power supply' or 'power source', while 電源投入 specifically refers to the action of turning on the power.
起動 means 'startup' or 'booting' of a system, often as a result of 電源投入.
power-on sequence
power-on password
Compound of 電源 (power source) and 投入 (input, insertion), literally 'power input'.