Can use ipad charger to charge iphone?

Ewwwwww! But I love it when you talk nerdy to me.

Thanks , one more question.

How does the iPhone know it can only draw .5 amps when pluged in to

A USB connection not a wall charger?

It doesn't have to "know". That's all the connection can supply.

As long as its output meets the USB spec of 4.5 to 5.5 volts. If it doesn't the phone will refuse to connect.

> No. The voltage is not as important as the current, which is regulated by the charging circuit.

Could you tell me what changes between trickle charge and fast charge?

Thank you!

You are being ridiculous, i am sorry to say.

Bass12 wrote:

....my iphone 4s charges at a much faster rate on the ipads charger then it does on the laptops USB port. ........

Of course your iphone4 charges faster with the iPad charger compared to charging with your laptop USB port.

Your iPhone 4 needs 1.0A to charge optimally.

Your laptop USB port will probably provides only 500ma, or 0.5A.

(I must say some laptop computers are capable of providing 1.0A by updating its BIOS )

The iPad charger, capable of providing up to 2.1A, will have no problem supplying 1.0A.

As a result, using your laptop USB port to charge your iPhone4 will take about twice longer than you using iPad charger.

I agree with the statement that using iPad charger will take same time as using the iPhone charger.

BUT THERE ARE SO MANY PEOPLE INSISTING iPAD CHARGER CHARGES FASTER THAN IPHONE CHARGER!!!!

We seriously need MORE RESULTS from verified, objective testing....

Simply insisting "Oh, I used both charger and you know what? iPad charge seems to be charging faster!! "

Unfortunately, I only have an iPhone 3gs, but not an iPad...

Can someone who has both iPad and iPhone carry out this "simple" test? All you have to do is measure the exact time.

1. Start chargint at same battery % level.

2. Close all application and kill all background processes.

3. Use your stopwatch, or anything that is quite accurate, to measure the exact time it takes to charge fully.

I don't really care if the side I am supporting is right or wrong....

I just want to see some solid test results that can back up either side of this argument...

The iPhone/iPod Touch/iPad chargers can be used interchangeably.

Some charge faster, some charge slower.

If it's an Apple product AND Apple charger, it's all good.

Anecdotal evidence does not trump science.

Bull.

Zero "evidence", 100% bull.

I knew I should have put quotes around the word evidence! 😟

I'm going to sacrifice my iphone and test the current regulator in it to seee... :)

I found this video on YouTube:

http://www.youtube.com/watch?v=DC4gPxc89Wg

Hopefully it will help all the people to understand how the charging process work!

Thanks; that should be convincing to anyone.