Yes, the smaller gauge number, the larger the wire is.
The larger the wire gauge, the smaller the diameter. 12 gauge is bigger than 14 gauge.
Yes, it is larger, the smaller the gauge the larger the bore i.e. 3 gauge is larger in diameter than a 8 gauge or a 12 gauge.
Yes, a #12 AWG conductor has a greater diameter than a #14 AWG conductor. A #12 conductor has an ampacity of 20 amps whereas a #14 conductor only has an ampacity of 15 amps.
In general, you should never use a breaker larger than 20 Amps on a #12 AWG (American Wire Gauge) copper wire.
12 gauge is thicker than 20 gauge. The lower the gauge, the thicker the sheet metal or wire.
You could be referring to anything from shotguns to steel plate, but I'll take a wild guess you are referring to wire gauge. 10 gauge wire is thicker than 12 gauge. If you were referring to something other than wire, write again and tell us what you are referring to.
12
no
it is not recommended because the 14 gauge wire is not capable of carrying the same amount of load as the 12 gauge wire which could result in a fire.
12 gauge
Yes you can. 8 ga. is better and more efficient than 12 ga. It will only benifit your install
The gauge of wire that is 12 volt is 18, 14, and 16.