No. At 125 volts, the same 15 amp current results in 10 times as much power. Ohm's Law states that amps x volts = power.
assuming a 12 volt car battery, 60 watts/ 12 volts = 5 amps, 125 amp/hours / 5 = 25 hours of life.
Yes, you can.
20 amp on a 12 volt system
No. If you connect two 12 volt batteries in series(positive to negative) to make 24 volts, you will have 100 amp hours. If you connect two 12 volt batteries in parallel(pos to pos, neg to neg) you will stay at 12 volts but have 200 amp hours
A 1-amp adaptor can not be used for equipment that draws more than 1 amp. It is not clear from the question which part of your system is 12 v and which is 20 v.
Assuming the wiring is sized for 12 amps, you can replace your fuse with any 12 amp fuse or smaller and with a voltage rating at or above what you expect to connect to it. The amp rating protects the wire, so you cannot go above what the wire can handle. The voltage rating is the max voltage that it can safely protect, so you cannot use a fuse with a lower voltage rating than you expect to connect to.
Volts * Amps = Watts 12 Volt * 2 amp = 24 Watts
Yes if it is a 12 volt DC bulb.
12 volt 10 amp charger is what you need.
It will be a 12 volt battery.
A .6 amp charger is a trickle charger. It would take days to charge a dead 12 volt battery with this charger. You need a 10 amp charger which will charge it in a couple of hours.
The amp hours capacity of a battery remains the same whether it is connected to a 12-volt DC load or a 120-volt AC inverter. So, the battery would still have 100 amp hours regardless of the inverter voltage.