why is resistance more in series combination and less in parallel combination

Resistance is directly proportional to the potential difference across the terminals of a circuit. In series, the potential difference is greater, thus offering more resistance. Whereas in the parallel circuit, the potential difference is distributed, thus, in each series less potential difference is observed. That is why lesser resistance is offered by the conductor.

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 The resistance in a series combination circuit is more because the resistors are connected end to end. However, in parallel combination, the resistors are connected individually, which leads to less resistance.

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