# Beta version

BETA TEST VERSION OF THIS ITEM

This online calculator is currently under heavy development. It may or it may NOT work correctly.

You CAN try to use it. You CAN even get the proper results.

However, please VERIFY all results on your own, as the level of completion of this item is NOT CONFIRMED.

Feel free to send any ideas and comments !

This online calculator is currently under heavy development. It may or it may NOT work correctly.

You CAN try to use it. You CAN even get the proper results.

However, please VERIFY all results on your own, as the level of completion of this item is NOT CONFIRMED.

Feel free to send any ideas and comments !

# Calculations data - conductor dimension and material

Wire dimensions | ||

Length of the conductor (wire) | <= | |

Length unit | ||

Cross-sectional area of the conductor (wire) | <= | |

Area unit | ||

Material parameters | ||

Substance from which the conductor is made | ||

Electric resistivity of the material | ||

Resistivity unit | ||

Resistance of whole wire | ||

Wire resistance | => | |

Resistance unit |

# Summary

Length of the conductor (wire) | 1 | |

Cross-sectional area of the conductor (wire) | 1 | |

Electric resistivity of the material | 2.6548×10^{-8} | |

Wire resistance | 0.026548 |

# Some facts

- By the
**wire resistance**we mean the resistance of the conductor as a whole. This is a value that we can directly**measure with an ohmmeter**by applying its probes on both sides of the wire. - The total resistance of the wire depends on:

**type of material**the wire is made of - for example, copper conducts electricity better than lead,

**temperature**- the ability to conduct electric current of various materials varies with temperature,

**wire dimensions**- it's length and cross-sectional area, in the case of**round wire conductor**, we can calculate approximated cross-section using disk area formula:

$A = \pi r^2 = \pi \left(\dfrac{d}{2}\right)^2 = \pi \dfrac{d^2}{4}$where:

**A**- cross-sectional area of the round wire,

**r**- wire radius (half of the diameter),

**d**- wire dimater, we can measure it, e.g. using**caliper**

- If we have a conductor with given dimensions and known material resistivity, then we can calculate its total electric resistance:$R = \dfrac{\rho \cdot l}{A}$where:
**$R$**- wire resistance as a whole, this value should be shown by an ohmmeter applied to the two ends of the wire,**$\rho$**- material resistivity from which the conductor (wire) is made,**$l$**- the length of the wire,**$A$**- cross-sectional area of the conductor (wire).

- If we know the resistance of the conductor at a given temperature (the so-called reference temperature) and we have the temperature coefficient of the material from which that conductor is made, we can calculate its
**resistance at another temperature**:$R_T = R_0(1 + \alpha \cdot \Delta T)$where:**$R_T$**– wire resistance at temperature**$T$,****$R_0$**– wire resistance at known (reference) temperature**$T_0$****$\alpha$**– temperature coefficient of resistance,**$\Delta T$**– temperature change**$T-T_0$**in Kelvins.

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