Flowing water
yes, air is also a source of electicity. For exampl, windmill.
A fuse or a circuit breaker can be added directly after the power source (and possibly a transformer) to do this.
Electicity from coal, oil, natural gas, nuclear, biomass, wind, solar, tidal sources.
No.
In an electrical circuit, electicity moves from the positive (+) end of the power source to the negative (-) end.
electicity
yes
kilowatts
yes
Almost all aircraft engines have generators. Most large aircraft also have an APU (small jet engine) specifically for providing extra electrical power.
Yes.