Why did trade increase in the roman empire

Some of the territories conquered had vast supplies of gold, good farmlands and other resources the Romans wanted.

Because as the Roman Empire increased, they had more land. And Since they had a more variety of land, they had access to more products that other cultures had and they didn't. So they were able to have more trade with the newer products they had acquired as the empire expanded.

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well, paralell is parallel. i am providing links to .

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a series circuit is one with all the loads in a row. there is only one path for the electricity to flow. if this circuit was a string of light bulbs, and one blew out, the remaining bulbs would turn off.

unlike in series circuits, a charge in a parallel circuit encounters a single voltage drop during its path through the external circuit. the current through a given branch can be predicted using the ohm's law equation and the voltage drop across the resistor and the resistance of the resistor.

a parallel circuit has certain characteristics and basic rules: a parallel circuit has two or more paths for current to flow through. voltage is the same across each component of the parallel circuit.