Lamp
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Put on each wire into each side of the battery.
After thats done the energy of the side with a - symbol (negative) goes into the +(positive) part.
It circles and all the energy passes lighting the lamp.
Thats how the lamps in your house work. This is called the closed system, but if you don't attach the wires perfectly, the lamp does not light up. It is called the open system.
Negative and positive are opposites, but they don't exist with out each other.

Magnetic
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Magnetics also need positive and negative.
Magnetics are a type of metal that are attracted or attract metal.
The positive magnetic and negative are "glued" to each other, but if you put a positive with one of the same kind or the negative with negative, they won't attract.
In Japan, some trains have a positive side on the bottom and on the tracks, the train floats because of the Magnetic law. That doesn't pollute the environment.


