# Voltage drop

The voltage drop is the voltage that is lost in a wire due to its resistance. The voltage drop can be decreased by using shorter or thicker wire, lowering the current or using a metal with a lower resistivity.

### Formulas

V is the symbol for voltage and is measured in volt (V).

ρ is the symbol for resistivity and is measured in ohm-meter (Ω⋅m).

l is the symbol for length and is measured in meter (m).

I is the symbol for current and is measured in ampere (A).

### Calculator

### Resistivity

Resistivity is the property of a metal to resist the flow of current. The resistivity is different for each material and it is measured in ohm-meter (Ω⋅m).

material | resistivity ρ 10⁻⁹Ω⋅m |
---|---|

silver | 15.9 |

copper | 16.8 |

aluminium | 26.5 |

tungsten | 56 |

iron | 97.1 |

platinum | 106 |

manganin | 482 |

lead | 220 |

mercury | 980 |

nichrome | 1000 |

constantan | 490 |