Power source

It seems like all the human races uses the same kind of power tools reletive to it´s technology level. As with all things in the stargate universe it seems like every world follows a pretty much alike technology timeline, that begins with a simple civilasation witch "improves" and build larger cities where many people live. Also every 1900-1950 civilasation in the stargate universe seems to have developed nuclear power sources, either for bombs or power regeneration.