What is the power input to the iPhone 7 and where is the spec page?
I found the tech specs at https://support.apple.com/en_US/specs/iphone. The site includes specs for iPhone 11 so you must go down the list to find iphone 7.
Generally, iPhones are 1A, iPads are 2A.
So long as the voltage is correct, the amperage doesn't really matter.
If you try to charge a 2A device with a 1A charger, it will charge more slowly.
If you charge a 1A device with a 2A charger, you won't see any difference to a 1A charger.
Amperage is "pulled" by the device, not "pushed" by the charger.