If you have Mac System with Magsafe adapter, you can easily identify power status via power adapter connector. If indicator light is orange its receiving power or indicator light is green its fully charged.
No default sound available to indicate attachment to wall power. But if your are using OS X Yosemite installed Mac system and you keeping your computer up to date, then you have option to turn on indicator sound.
Mac OS X 10.10.3 update includes a new service which provide an audio notification sound when your system attached to power.
How to enable Power charging indicator sound
PowerChime – a small app provide this service. This app available in (/System/Library/CoreServices) – System’s CoreServices directory. You can enable this service by running the following terminal command on a Macbook that has a Magsafe adapter.
Open Terminal and type the following command.
defaults write com.apple.PowerChime ChimeOnAllHardware -bool true
Now navigate to Macintosh HD -> System -> Library -> CoreServices and launch the PowerChime.app file. It will open but not show any windows.
When you finish these steps, your MacBook pro or MacBook Air should alert you with a small chime sound when you connect power adapter like you connect iOS device (iPhone or iPad).
If you can’t hear indicator sound after rebooting, log in or log out when power is attached ?
Then navigate to System Preferences -> Users & Groups. Choose you account and select login items, and then add the programs to the list of login items for your account.
Note : It will play indicator sound even if your Mac sound muted. If you want to temporarily quit the service, open Activity Monitor via Applications -> Utilities folder.
Search and find “PowerChime” and close the program (But it will relaunch when your computer rebooted).
How to disable power charging indicator sound
Open Terminal and run the following command.
defaults delete com.apple.PowerChime ChimeOnAllHardware
Also remove PowerChimp app from your login items if you already added.