10W charger for iPad and 8W for iPhone...

May seem a daft question (sorry!) but if I accidentally used the iPad plug for the iPhone, thereby charging it 2W higher than it 'should be', will it damage the iPhone? If yes, why do they look identical?! If no, I don't suppose it matters, just want to find out before I accidentally do it as I can see that day coming a mile off...!

Wattage is a measure of power, not of voltage.
The difference is the amount of power the adapter can provide.
"Excess" power is not an issue, the lack of power is.
So for example, if you try and charge an iPad with a lower wattage adapter, it may not charge at all or will take longer to charge.
But it will not hurt to charge your iPhone or iPod with the higher power iPad adapter.

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