I wanted to extend the length of my charging cables. So, I bought these USB 2.0 extension cables from Frys:
When I got home, I realized that *maybe* USB 2.0 extensions won't fully charge a 2.1 amp iPad (which uses the lightning cable) or a 1.2 amp smartphone (which uses miniUSB connectors).
But I'm not sure...
I'm confused how the USB 2.0 versus USB 3.0 spec has to do with the current that the device (wall charger or computer) will give the iPad or smartphone in the specific case of the USB extension cable.
So, fundamentally, I'm asking whether it matters when charging a late-model iPad Air (lightning cable) or smartphone (Nexus 5) whether I use a USB 2.0 or a USB 3.0 extension cable?