I have an option of chargers with different amp ratings ...
The voltage is 5V but what is the current?
For example ... 2.4A, 1.0A ...
More importantly were is the Apple site for the iPhone 7 where they would have specifications?
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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.