20 amps for 12 gauge wire
12 gauge wire is sufficient. Any larger is fine, but superfluous.
As the AWG wire numbers get smaller the wire size gets larger so a #20 wire is larger that a #26 wire 26
12 gauge is thicker than 20 gauge. The lower the gauge, the thicker the sheet metal or wire.
Yes, a 20 amp circuit requires a number 12 gauge wire.
12 American Wire Gauge (AWG). 12 AWG.
For your typical residential application American Wire Gauge 12, or 12 AWG is rated for 20 amps.
Yes but there are two stipulations, one that the join or splice must be made in a junction box that is accessible and has a removable cover and the second stipulation is that the breaker that is supplying the power can not be larger that the smallest conductor. In this case no breaker larger that a 20 amp breaker as #12 wire is only rated at 20 amps..