Resistivity Using Line Losses (DC Two-Wire US) Calculator

Resistivity Formula:

\[ \rho = \frac{A \times P_{line}}{2 \times l \times C_1^2} \]

Area of Underground DC Wire:

m²

Line Losses:

Length of Wire DC:

Current Underground DC:

Resistivity (ρ):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is Resistivity?

Resistivity is the measure of how strongly a material opposes the flow of current through them. It's a fundamental property that quantifies how strongly a given material opposes the flow of electric current.

2. How Does the Calculator Work?

The calculator uses the resistivity formula:

\[ \rho = \frac{A \times P_{line}}{2 \times l \times C_1^2} \]

Where:

\( \rho \) — Resistivity (Ω·m)
\( A \) — Area of underground dc wire (m²)
\( P_{line} \) — Line Losses (W)
\( l \) — Length of Wire DC (m)
\( C_1 \) — Current underground DC (A)

Explanation: This formula calculates the resistivity of a material based on the area of the wire, line losses, length of the wire, and the current flowing through it.

3. Importance of Resistivity Calculation

Details: Calculating resistivity is crucial for selecting appropriate materials for electrical wiring, designing electrical systems, and understanding the conductive properties of different materials in DC power transmission systems.

4. Using the Calculator

Tips: Enter the area of the underground DC wire in square meters, line losses in watts, length of wire in meters, and current in amperes. All values must be positive numbers greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: What is the significance of resistivity in electrical systems?
A: Resistivity determines how much a material resists electric current flow, which affects energy losses and heating in electrical conductors.

Q2: How does resistivity differ from resistance?
A: Resistivity is an intrinsic property of the material itself, while resistance depends on both the material's resistivity and its physical dimensions (length and cross-sectional area).

Q3: What are typical resistivity values for common conductors?
A: Copper has about 1.68×10⁻⁸ Ω·m, aluminum about 2.82×10⁻⁸ Ω·m, and silver about 1.59×10⁻⁸ Ω·m at room temperature.

Q4: How does temperature affect resistivity?
A: For most metals, resistivity increases with temperature due to increased atomic vibrations that impede electron flow.

Q5: Why is the formula specific to DC Two-Wire US systems?
A: This formula accounts for the specific configuration and loss characteristics of underground DC two-wire systems commonly used in US power distribution.