Two batteries, put them in series and either measure the voltage with a voltmeter, or with a fan connected watch the speed increase. A parallel connection will increase the current available but will not have an obvious change in output, as the current available is just that, ready for use. You can do something else with parallel and that is to have a volt meter showing that there is a current flow between the two batteries and that is why batteries connected in parallel will discharge.
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This question does not make any sense. "Real world" load, from the perspective of the power producing generator, can be reduced to a lumped resistance in series with a reactive component (either inductive or capacitive). In reality, the load connected to that generator has series elements and parallel elements.
If one light goes out on a series-parallel connected string, all of the lights in that particular series string will go out. The other parallel strings will not be affected. If you are asking about Christmas tree lights, please note that most modern low voltage bulb designs make the bulb short out, rather than open, when the filament burns out. This keeps the other bulbs in that series string on, although they now have more power and are more likely to also burn out.
You need a Battery, Light Bulb, Ammeter, Switch.
The programs have to be developed that way, to use the libraries supporting parallel processing. It isn't automatic.
experiment on your own! :p lol :) HAHAHAHAHA