Question about Apple USB C

I don't know, but the cable is thick. I also have thin cables and charging is much slower.

This depends on the charger and also on the device to be charged and not on the charging cable.

I don't know....

Definitely up to 65 watts, but it depends on how many watts your power supply has and how much your end device can handle. I think the cable can easily handle 100-150 watts.