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If a self-excited generator lost all its residual magnetism, can it build up an output voltage?
You should honestly be able to build a wind powered generator in any town because its the one type of generator that causes the least environmental damages. You can ask for a permit from your city hall.
A hydroelectric generator does not require much maintenance. If you build it right or if you purchase a decent generator, you should not have much problems.
not without a permit
List the factors that affect the voltage building in D.C generator.
solar power with a backup generator
You can't there is no such thing as "free energy".
Build a generator that uses the kinetic energy in water as it motivational input.
10 meters of wire
THat depends on what you would use it for.
You can buy a solar generator at Goal Zero or at their website. You can also build a solar power generator for under 300 dollars. The instructions are on the How Stuff Works website.
no way