**Resistivity**: Measure of the resisting power of a specified material to the flow of electric current.

**Resistance**: The property of a material which opposes the flow of electric current through it.

**Capacitance**: The amount of charge that can be stored inside a capacitor at a given voltage.

Material | Resistivity(ohms/m) | Usage |
---|---|---|

Silver | 1.64 × 10⁻⁸ | Conductor |

Copper | 1.72 × 10 ⁻⁸ | Conductor |

Aluminum | 2.8 × 10⁻⁸ | Conductor |

Gold | 2.45 × 10⁻⁸ | Conductor |

Iron | 1.23 × 10⁻⁷ | Conductor |

Lead | 2.2 × 10⁻⁷ | Confuctor |

Germanium | 4.7 × 10⁻¹ | Semiconductor |

Silicon | 6.4 × 10² | Semiconductor |

Paper | 10¹⁰ | Insulator |

Mica | 5 × 10¹¹ | Insulator |

Glass | 10¹² | Insulator |

Teflon | 3 × 10¹² | Insulator |

**Example**:

Calculate the resistance of an Al wire that is 2m long and circular cross section with a diameter of 1.5mm.

**Solution**

R=ρL/A. Where: R=resistance, ρ= resistivity, L= length, A= Area.

R= (2.8 × 10^-8Ω/m × 2m)/1.768×10^-6m² = 31.69Ω

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