Not always. You could have a conduit with 10 pairs of 14 gauge wire - not every wire in that bundle are going to be ground. Ground is usually identified as having a green coating on the wire ... sometimes it is just bare copper strands or a solid copper wire.
The lower gauge number is always a thicker wire which can carry more current.
The wire sheathing itself is usually marked. e.g. 14 CU 2 or 14/2 CU will indicate 14 gauge 2-wire (+ ground) copper (CU being the symbol for copper on the periodic table). For 15amp circuits you will likely has 14 gauge wire with most of that being 14/2 (Usually white, black, and bare copper).
The '12' and '14' refers to the gauge of the wire. A 14 gauge wire is used for circuits drawing 15 amps or less; general lighting and outlets. A 12 gauge wire is used for 20 amp circuits, like dishwashers, disposals, and microwaves. The '-2' refers to the number of conductors in the wire. 14-2 is a 14 gauge wire with 2 conductors in the sheath. A 14-3 with ground would have three conductors plus a ground in the sheath, for a total of four wires, and is most often used for ceiling fan wiring and three way switches.
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.
The gauge of wire that is 12 volt is 18, 14, and 16.
The larger the wire gauge, the smaller the diameter. 12 gauge is bigger than 14 gauge.
They are close but not the same. For example, 14 gauge steel is .0781 inches thick while 14 gauge steel wire is .083 inches thick.
16 Ga wire is smaller than 14 Ga. The answer is absolutely NO!
No - the two have no relationship to each other at all.
0.064084 diameter
It is better to use 16 gauge or 14 gauge speaker wire for your home theater applications.