## Abstract

We investigate the electrical current and flow (number of parallel paths) between two sets of n sources and n sinks in complex networks. We derive analytical formulas for the average current and flow as a function of n. We show that for small n, increasing n improves the total transport in the network, while for large n bottlenecks begin to form. For the case of flow, this leads to an optimal n^{*} above which the transport is less efficient. For current, the typical decrease in the length of the connecting paths for large n compensates for the effect of the bottlenecks. We also derive an expression for the average flow as a function of n under the common limitation that transport takes place between specific pairs of sources and sinks.

Original language | American English |
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Article number | 28005 |

Journal | Lettere Al Nuovo Cimento |

Volume | 84 |

Issue number | 2 |

DOIs | |

State | Published - 1 Oct 2008 |

Externally published | Yes |