IPad charger can charge to iPhone ?
That 's ok? IPad charger can charge to iPhone
Apple's official statement:
"I have a iPod touch, only the data line, apple is not generous send charger. Later, with the iPhone4, apple and gave the charger is convenient, I do not have a computer to use the USB interface, but one day iPad, this gave different chargers, so I lost, never thought will also meet the charger tangle." Li Xue is a fruit, like she had encountered such doubt. Recently many.
This one is also a topic has been controversial. IPhone that is simple and iPad charger can charge equipment. The main reason for debate or struggling is because different parameters caused by the two charger. As mobile devices become more and more popular, almost every day we have to face to the charging equipment problems, and many are in the form of a USB interface, everyone has a question, is my this device charger can give another one the same interface using?
Today we are not going to talk about USB power adapter iPad equipped with 10W can be used to iPhone this topic, and also discuss other USB equipment charger common problems. For example, HTC mobile phone adapter I can charge to other Android mobile phone me?
From apple:
First we start with the iPad and iPhone dispute about. First look at the two paragraph equipment standard charger specifications.
Parameter ratio:
IPad charger: 5.1V 2.1A, rated power 10.71W
IPhone charger: 5V 1A, rated power 5W
Then the iPad charger 10.71 watt power can only use 5 Watt iPhone4/4S mobile phone charger charging? Will not burn out iPhone4/4S? We found that we assured answers on Apple's website.
From Apple's website:
Official recognition of the available iPad charger charging iPhone4/4S
Apple's official answer: iPad charger is right 10 watt, is designed for iPad device, but you can be used for charging the iPhone and iPod series. [official reference links to the 1] [the official reference link 2]
Yes, apple said no problem, filling. No more explanation, there should be a lot of people still feel that not enough "". Okay, we understand together, why the apple said. Then from the junior middle school physics in the chapter about electric. Do you remember, P=UI?
Page second: why can?
Power is determined by the voltage and current. We discuss now is the adapter, then rated voltage has a fixed U=5V, this is decided by the adapter itself, it is the 5V (tentatively as integer). You can decide P is the current I, I we can think of is determined by the device. You use the iPhone and iPad because of its impedance, decided will need more high current output.
Or back to just two parameters for the adapter:
IPad charger: 5.1V 2.1A, rated power 10.71W
IPhone charger: 5V 1A, rated power 5W
We discussed here is the use of 10W (10.71) iPad to the standard 5W charger iPhone charger, how do you understand?
We all know the knowledge of Physics
Before the discussion, also let everybody to understand the nominal parameter two adapter.
5V is the two adapter factory rated output voltage setting, this would not change (know you have something to say, don't seriously). As for the iPhone4/4S charger is 1A or iPad charger is 2.1A, the maximum allowed current is expressed through, also is the highest output power of 5W and iPhone4/4S charger, iPad charger provides 10W output power.
That is to say whether you even not even iPhone or iPad, the adapter is the output voltage is 5V.
Take home electricity and tap metaphor
We look at the picture below, which is connected to the USB port by Mac OS system to detect iPad, system testing the lowest current security requirement of iPad. Display 500mA clear. This is the basic output current of 2 USB ports.
Apple iPad current required for 500mA
With Apple's own "system" function detection iPad
If the computer using USB 2 interface to the iPad charging, can not charge. This view is not correct, but did not reach iPad own more current through the support, and did not show the normal "charging" logo.
Here we say USB 3, USB 3 interface transmission speed is 10 times more than 2 products, not only that, in the power supply is more current is increased to 1000mA or 1A. USB 3 cable internal line number from 4 up to 2 to 8 root. 3 of the interface can be said to better support iPad charging.
It can not help but someone may ask, am I going to change USB 3 interface board or box to meet me only to give iPad charging requirement? Is USB 2 really didn't play out? Of course, can not say so.
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