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Do you mean how much power does it produce? None are working as yet.
False
Nuclear fusion refers to a nuclear reaction wherein two light nuclei fuse to form a heavier nucleus. This process releases energy.
I think you mean "Cold Fusion" It is the (currently) hypothetical nuclear fusion reaction which happens at ambient temperatures?
You probably mean nuclear fusion
Everything, so to speak, is nuclear powered, because everything ultimately gets its energy from the Sun, and the Sun's energy is fusion nuclear power. This includes the food we eat and the raw materials we are made of.
If you refer to how the sun gets it's power, that comes from nuclear fusion. Should you mean to ask if what energy it gives of is radiation, then yes.
A fusion barrier refers to the repulsive charge between two nuclei that must be overcome to initiate fusion.
Please elaborate on "they" as no comparison can be given otherwise. Do you mean?: "How is nuclear fusion different from regular nuclear reactors (nuclear fission?)"
I think you mean nuclear fusion, the reaction that powers the sun.
By 'devices' do you mean nuclear weapons, or peaceful uses of nuclear power?
You probably mean Iran.