Currently Being ModeratedJun 12, 2011 3:52 PM (in response to Madmole)
However Apple have put size and form over function and omited a lot of the electrics that normal transformers have, thats why most 5V 1amp transformers are 3 times the size of the apple one"
No, it's not a transformer, it's a switched mode power supply. At least google it.
The iPad's PSU does not contain a transformer, it is based on a switche mode power supply. Therefore, there is no primary and secondary coils to short out. Again, do your googling!
Currently Being ModeratedJun 12, 2011 4:02 PM (in response to oddballo)
Also, take a look here http://en.wikipedia.org/wiki/Switched-mode_power_supply#SMPS_and_linear_power_su pply_comparison, look for the "Risk of electric shck" row in the table. For the SMPS column, it reads:
Common rail of equipment (including casing) is energised to half mains voltage, but at high impedance, unless equipment is earthed/grounded or doesn't contain EMI/RFI filtering at the input terminals.
and the notes column:
Due to regulations concerning EMI/RFI radiation, many SMPS contain EMI/RFI filtering at the input stage before the bridge rectifier consisting of capacitors and inductors. Two capacitors are connected in series with the Live and Neutral rails with the Earth connection in between the two capacitors. This forms a capacitive divider that energises the common rail at half mains voltage. Its high impedance current source can provide a tingling or a 'bite' to the operator or can be exploited to light an Earth Fault LED. However, this current may cause nuisance tripping on the most sensitive residual-current devices.
Currently Being ModeratedJun 28, 2011 4:58 PM (in response to davidrfromfalkirk)
This is the most sensible post on the matter I've seen - thank you! So David you are essentially saying this is by design. Apple need to tell people this as it is definitely a cause for concern when it first occurred.
Currently Being ModeratedJul 5, 2011 10:52 AM (in response to oddballo)
I've had confirmation from apple europe that this is indeed normal behaviour:
"The response from our engineering dept states that the behaviout of the ipad while connected to the charger would be expected. There is measurable AC voltage across the external metal parts when an iPad charges. The measured voltage is within the SELV (Separated Extra-Low Voltage) limit, which means that the iPad is safe to touch. Additionally, the touch current is within the safety limit according to UL/IEC 60950 (Safety of Information Technology Equipment).
In the United Kingdom, Ireland, and other countries using similar AC power plugs and sockets, all AC plugs have three prongs; however, only the AC plug with cord is grounded. The shorter "duckhead" plug is not grounded"
Hope this clears it up for everyone. This is direct from apple support themselves so the source is trusted.
Currently Being ModeratedJul 27, 2011 8:29 PM (in response to G-UNIT-UK)
I noticed eveyone commenting on this thread ther iPad was plugged in well I'm feeling this constantly whether it's plugged in or not . This has happen on two iPad 2 two days apart purchased at the same location . My original iPad 2 at launch in march never experience anything like being described but the other two recents iPad 2 doing this electronic shock etc when charging or not all the tme can't not hold it at all
Currently Being ModeratedAug 4, 2011 10:22 PM (in response to spr40)
It's something different? You're casing cannot be energised at around midpoint of supply voltage if the supply isn't there.
Maybe there is a fault and you are feeling some kind of backfeed through the power supply section. Unlikely tho.
Currently Being ModeratedSep 14, 2011 7:34 AM (in response to oddballo)
I'm in Singapore and I have just experience the same thing. It was in a quite a dry room, running of the mains charger. It only happened when I moved my fingers up and down the metal frame of the IPad2. Have never felt this before - seems new. Think having paid for Apple Care (btw don't purchase Apple Care for iPhones in Singapore - it doesn't actually bring any value and Singtel just either replaces or doesn't - there is no repairing) I will take it to Apple store and see what they have to say.
Currently Being ModeratedApr 10, 2012 3:50 AM (in response to oddballo)
Same issue here.
The static/vibration/current feel is along the left side of my Ipad 2 when plugged using the power supply I was provided at purchase. It only happens when the device is horizontal. Like if I'm lying it on the arm of my sofa.
Going to take it into my local apple store. I'm sure its safe and working as intended but I just need that assurance seeing as the Ipad didn't come with a warning about that to start with.
I am from the UK, using an IPAD 2
Currently Being ModeratedApr 10, 2012 12:52 PM (in response to rossjames)
Let me know what your Apple Store tells you about this vibration. My new Ipad is doing the same thing.
Currently Being ModeratedMay 31, 2012 5:47 AM (in response to smscca)
Well I have just experienced this tingle on my Macbook Pro with the magsafe 85w power supply and the 3 pin plug lead with a UK 3 pin plug.
I could not believe that Apple would not earth the machine via the magsafe adapter, so I detached the power lead from the 85w power supply block and took a look how they earth it. The power supply block has a 2 pin connection for live and neutral and the earth connects via the 10mm dia stainless steel stud that the plug lead [or the plug with no lead] slips over to lock it onto the block. Then I saw the problem! On the end of the 10mm stud, the manufacturer had put a 12mm disk of protective plastic [the peal-off film type that you often find on say a new phone screen]. So in their efforts to keep the stud looking shiny and polished, they insulated it from electrical connection, that is they insulated the EARTH STUD !! Just peal it off, plug it back together and [unsurprisingly] there is no more tingle from the alloy case.
Currently Being ModeratedJul 19, 2012 2:44 PM (in response to oddballo)
I've only had my iPad 2 for a few weeks but noticed anytime I charge it I get this electric current running through the case so I bought a plastic protector case which obviously stopped me feeling the charge when I touched it. I thought this was the end of it....until I was using the iPad whilst it was charging and as my finger got close to where the charger goes into the iPad, Igot a small electric shock and saw a bright blue flash! Will be taking it back to apple as soon as I have the time!
Currently Being ModeratedAug 8, 2012 10:31 AM (in response to oddballo)
Have the same problem when connected to the charger (Ipad 3) (uk user) but also gives this effect when plugged into the USB on my laptop
Currently Being ModeratedJan 19, 2013 11:56 AM (in response to oddballo)
This is not a UK problem it is the adapter in general I don't know if the vibration is as strong here because of the 110 sockets we use compared to your 220 but ours is definitely grounded properly and does the same thing but I have noticed that a lot of bare metal appliances do the same thing such as my refrigerator but it is not even an issue if you hold the iPad correctly
Currently Being ModeratedJan 17, 2014 5:21 AM (in response to oddballo)
All Apple devices have that feeling. This is because the main body of the device is Aluminium. The charging port is connected to the main body and results in an overflow power into the battery. Since the battery is only allowed a certain amount of power at any one point of time to preserve battery life, the remaining power leaks into the Chassis. All other computers have the same problem, only that the other computers are made of plastic, but however the Apple Devices are much more durable than other computers. This is completely normal, and is no cause for alarm; and therefore you do not need to keep buying power cords for your Apple Devices
Currently Being ModeratedFeb 27, 2014 7:16 AM (in response to Iship)
- Your power supply is not earthed with the short lead: it makes my Power Book Pro case tingle (not the track-pad). It is due to a floating earth! I got around this by using the longer mains charger lead, which is earthed, plugged permanently in the Power Book Pro via a mains timer, so that the charger is not charging the battery all the time, but the computer is earthed.