Iphone charger, 1A.

I have a Iphone 3Gs with the original Iphone charger.
On the charger it says that it supply's  5V,1 A, and a normal computer usb-port supply's 5V,0.5 A.
Is it safe to use my mp3player with the Iphone charger?
On my mp3 players charger it sayd 0.5 A but I lost it.

Can my mp3 player's battery break if I use double the current that is recommended?

Question 2: If I buy those Iphone chargers on ebay, is it safe to use them on my Iphone?

Question 2: If I leave my charger in the outlet will it still draw current?
Without any devices attached to it?

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You can use the supply, it will only supply the current your appliance needs, if the voltage is the same
Popstickal (author)  steveastrouk7 years ago
Ok, so I can use usb devices that uses everything from 0-1 A?
If its still 5v.

But iphone chargers also send some volt on the data pins.
Is it harmful?

They can't send out more than USB voltages.
Popstickal (author)  steveastrouk7 years ago
Ok, theoretical if I have a power source that supply's 5V but 20A, would it still be ok for my Iphone?
Does the Iphone only draw a certain amount of current that is needed for it to charge or will it blow up?
Yes, it only draws what it needs !
Popstickal (author)  steveastrouk7 years ago
I'm sorry for asking you all the questions but I have one more.

If a use a nokia charger that output's 9V, 500 mA.
If I use a 7805 voltage regulator will it become just lik a computer usb-port?
Yes !