As asked, the question cannot be answered.
However...
if the voltage levels were the same, yes.
Electrical energy is measured in Watts. To calculate Watts, use the following formula:
Watts = Volts * Amps
Increased volume on any amp, valve or solid state, will use more electricity.
A 12 amp current is stronger than a 9 amp current because amperage is a measure of electrical current flow. More amps indicate a higher flow of electricity, which means a 12 amp current can power larger devices or provide more energy than a 9 amp current.
A 200 amp electrical service panel can handle more electrical load than a 100 amp panel. This means it can power more appliances and devices without overloading. The 200 amp panel is typically used in larger homes or buildings with higher electricity needs, while the 100 amp panel is suitable for smaller homes or buildings with lower electricity demands.
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.
The 12 Amp fuse will take a larger current before it blows (or trips) - than a 10 Amp one.
The difference between fuses is the current that they are designed to support. A fuse is intended as a safety measure to protect against overload. A 3 amp fuse should burn out if more than 3 amps is run through it, with some allowance for standard variance. A 13 amp fuse would burn out with greater than 13 amps. It is always a bad idea to use a fuse bigger than you need, because if your component is designed for a 3 amp fuse and you use a 13 amp fuse, there is a good chance you could damage your component with too much amperage because the fuse would not burn out at 3 amps, as was intended.
The 50 ampere engine fuses is blowing because more than 50 amperes of electricity is passing through it.
The unit of current flow is AMP.
A 100 amp service provides less electrical capacity than a 200 amp service for a residential electrical system. This means that a 200 amp service can handle more electrical load and is better suited for larger homes or homes with higher electricity needs.
Yes you can burn a channel on an amp. Which is do to a overload. Like a 2 ohm load on an amp that is not 2 ohm stable. Will burn out a channel or both channels.
No more than 13 maximum on a 20 amp circuit.
12 amp more than likely. Hmmm... I'd start with a 10 amp but never higher than the rating...