The amps that a four gauge wire will handle will depend with the thickness of the wire. If the wire is thin, the four gauge will handle 95 amps.
A 14 gauge can handle up to 15amps.
the gauge of the wire determines how much amperage a wire can carry the insulation determines how much voltage the wire can handle
A 12 gauge wire on a 20 amp breaker can handle 2,400 watts. The electrical code states it can never continuously be loaded to more than 80% which equates to 1,920 watts.
14 gauge will handle it with a 15 amp breaker. If you use 12 gauge use a 20 amp breaker.
A #14 copper wire will handle 760 watts with some to spare. Load on a #14 wire is 15 amps X .8 = 12 x 120 = 1440 watts.
Wire gauge refers to the diameter of the copper conductor. This is important because this determines how much current the wire can handle. For example in normal use 14 gauge wire can handle 15 amps, 12 guage wire can handle 20 amps.