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How much faster is wall charger than USB?

philgilder said:
yeah... its a usb sync cable, so it can charge the iphone. same cable
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Heheh..That's good to know. I didn't even check it, but I've been bringing my iPhone's cable into the family room to sync to iTunes (I usually have it plugged into the wall adapter next to my bed for nightly charging). For syncing, I've been plugging it into the same USB hub as my daughter's cable for syncing her Nano. I never bothered to notice they use the same connector. :eek:

I don't remember where I saw it, but something suggested using the wall adapter during an update instead of a computer's USB. I had assumed it was because the adapter is capable of delivering more current, but further thought leads me to think it is so the computer doesn't go to sleep and kill the power mid-update.
 
I don't seem to remember any difference with my 2G iPhone, but it very well could be different now.
 
think about it. there is 110 volts in the wall. a computer runs on 110 volts and when you plug your iphone in, it doesnt harness all of the power from the computer, especially if you have a laptop.
 
benflick said:
think about it. there is 110 volts in the wall. a computer runs on 110 volts and when you plug your iphone in, it doesnt harness all of the power from the computer, especially if you have a laptop.
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what are you talking about?
different countries have different voltages, in the UK its 240V

what the wall adapter does is convert the wall power into the same type of power as standard usb supplies, therefore 5V at 1000mA

older ipod chargers that dont work with iphone use 5V at 500mA, and therefore are disabled by the iphone
 
@doobi - You're not always right

doobi18 said:
ahh negative.

although both iphone ship with USB-wall chargers and will only sync with your computer over USB, they will both stil charge off an old iPod FW wall-charger.
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Negative. The iPhone 3G will not charge on FW wall chargers. Says accessory is not compatible...
 
philgilder said:
errrrr
yeah there is
6-20-07-iphone_dock_1.jpg

thats the 2g iphone
Click to expand...

err thats the first gen iPhone.
There is not a 2G iPhone.
If anything 3G is the 2G iPhone.
 
Chronimac said:
err thats the first gen iPhone.
There is not a 2G iPhone.
If anything 3G is the 2G iPhone.
Click to expand...

"err", you're missing the point. Technically, EDGE cell networks are considered 2G or 2.5G (G meaning generation). First Gen cell data networks are GPRS (General Packet Radio System--or service depending on who you ask).

Therefore, though the first iPhone could be considered "the 2G iPhone", if the person is referring to the network technology the phone is capable of using.
 
SHIFTLife said:
"err", you're missing the point. Technically, EDGE cell networks are considered 2G or 2.5G (G meaning generation). First Gen cell data networks are GPRS (General Packet Radio System--or service depending on who you ask).

Therefore, though the first iPhone could be considered "the 2G iPhone", if the person is referring to the network technology the phone is capable of using.
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exactly

3G for the iphone does not mean 3rd generation iphone, it means it uses 3rd generation mobile network technology
therefore, the 1st iphone, which uses EDGE (which is 2.5G as SHIFTLife said) is actually a 2G device, therefore 2G iPhone
 
benflick said:
think about it. there is 110 volts in the wall. a computer runs on 110 volts and when you plug your iphone in, it doesnt harness all of the power from the computer, especially if you have a laptop.
Click to expand...

Wiki: The USB specification provides a 5 V supply on a single wire from which connected USB devices may draw power. The specification provides for no more than 5.25 V and no less than 4.75 V (5 V±5%) between the positive and negative bus power lines.[12] Initially, a device is only allowed to draw 100 mA. It may request more current from the upstream device in units of 2 mA up to a maximum of 500 mA.

If a bus-powered hub is used, the devices downstream may only use a total of four units — 400 mA — of current. This limits compliant bus-powered hubs to 4 ports. The host operating system typically keeps track of the power requirements of the USB network and may warn the computer's operator when a given segment requires more power than is available.


it really has nothing to do with how much volt the power outlet provides. it's about how much the USB cable can actually carry. Let's say the power of MacBook consumes total of 60W. For 110V outlet, that means 545 mA of electric current. So let's assume you consume 545 mA of electric current through USB cable providing max of 5V. that's only 2.725W. However, bare that in mind that the max possible current for USB is 500 mA, which means the iPhone can only consume the max of 500 mA (2.5 W) when charging. the computer can provide more than enough for that. to summarize it all:

the wall charge better than computer charge is a myth.
 
Where 2g = 2nd generation also known as version 2, or v2, or iPhone 3G...
Wall seems a tad faster, but could check as my phone's reaching 10%... I'd go with a real world testing/multimeter, rather than pontification, but I think the docks are kind of subliminally sold as faster as an assumption.
 
Pointless

This Forum has no answer...

does the iPhone 3GS firmware 3.1.3. Charge Faster in the Wall Socket or in a PC USB 2.0?

The wall Charger is a AC to USB. ie: u plug the USB Dock cable into the wall charger.

WHICH WAY IS FASTER, OR ARE THEY THE SAME???
 
it will charge faster from a wall outlet than on a USB through your computer...don't ask me why but trust me..my iPhone charges on a USB at work and takes longer to go from 50% to full than from 20% to full at home on an outlet...I am an advocate of "outlet charging"
 
If you read the print on the front of the wall charger it says it outputs 5v at 1 amp

So it is double the current of the USB spec and will therefore charge faster
 
Yup. If you need a fast charge, plug it into the wall. If it's something over night, you can use USB.

Wall is always faster.
 
Sooooo is charging over wall twice as fast? I was wondering why it takes so long to charge over usb.

@AbSoluTc
love your avatar;)
 
I use my laptop + usb to charge phone sometimes.. but it slower compared to the wall outlet. Thats a fact on my end.
 
vizkiz said:
Depends on what current the car charger is rated to put out. I know my car charger (Griffin Powerjolt) charges sloooow. Probably 500mA like USB, but I'm not sure.
Click to expand...

the one I'm gona use says 5VOLT 1A. Shouldn't that be faster?
 
Anyone notice a difference using a dock? I have 2 docks...one is plugged into my laptop dock at work and the other is plugged into the wall in my living room (use that one to play music though my stereo). Both are much slower at charging than the usb + AC adapter in my bedroom.
 
Actually, as someone pointed out, the official wall charger is 1A not 500mA. So, if you have just a regular USB2 port, the wall charger will somewhere between 1x and 2x as fast (charge current drops as the battery gets fuller)


Modern Macs support a USB extension for negotiating up to 1000mA of current as well, by sending a special request packet to the USB host controller and the host acknowledging it. You can see how much current is requested from System Profiler.


This information was popularized during the iPad "Not Charging" fiasco. Basically, if your iPad hooked up to your USB port reads "Not Charging", then your USB port only delivers 500mA. Otherwise, it delivers 1000mA.
 
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