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Odd phenomenon when charging.

OP PcFish

14th May 2014, 05:04 PM   |  #1  
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I'm procrastinating at work, noticed something weird.
When the phone is charging, I glide my fingers across the back, and feel a faint charge, kind of like the phone is vibrating. Maybe my fingers are super sensitive to the grooves in the finish? I don't know.

As an engineer, let's go about this scientifically.

Control:
  • Naked HTC One M8 (Gunmetal) with Spigen Tempered Glass Protector
  • OEM HTC Charger that came with the phone
  • Plugged in to a surge protector. The only other thing plugged in is the AC Charger for my HP Elitebook
  • Phone is face down while plugged in on wooden desk

Test:
  • Gently glide finger across the back of the phone.

Anyone else feel this? Or am I going crazy at my government job?
14th May 2014, 06:03 PM   |  #2  
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Just tried it and felt it too!
14th May 2014, 07:18 PM   |  #3  
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Next step is voltmeter and phone case vs ground. It's possible that the charger isn't properly grounded, so although it only delivers a potential of 5V, those 5V are sitting on a 50Hz sine wave of, maybe 30-50V (thats a guess based on my experience of electrical shocks).
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