HSK 6
电源
diànyuán名
electric power source
修机器前请先关闭电源。
Xiū jī qì qián qǐng xiān guān bì diàn yuán.
Turn off the power supply before repairing the machine.
Say it
Hold the button, say it, then let go.
Other HSK words sharing a character
Also free:
New in the HSK 3.0 word list at level 6.