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.
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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..
A domestic D/W uses 14 gauge wire.
No. A 20 amp breaker needs 12 gauge wire.
No, 10 gauge wire requires the use of a 30 amp breaker. A 20 amp breaker is only used on 12 gauge wire.
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