Is a three ping taken grounded from the computer?

Is taking three ping on the power cord to the ground the MacBook Air (mid-2013) 10.10 I use?

I read that cable to a laptop computer, printer with a record of three ping, 'grounds' the computer.

Would like to know that Apple has taken this problem of grounding into account in the design but don't

find this information.  Would be very happy if someone could explain MacAir, computer laptop, put in the Earth

information simply.

Thank you for your time and your consideration.

Yes. It is connected to the Earth.

Tags: Notebooks

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