Although the Scandinavians learned about sail very early, they did not start to use it on their ships until the 8th century. Why not?

Viking ships were built by the Scandinavians during the Viking Age (c. ... Although before the Viking Age most boats had their planks lashed together, ... The addition of oars and sails gave Viking boats an advantage over all other ... does not mean they did not exist earlier on, however!) until the 10th century.

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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.

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