1. What is Resistivity?

Resistivity is the measure of how strongly a material opposes the flow of current through them. It is a fundamental property of materials that determines their electrical conductivity.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \rho \) — Resistivity (Ω·m)
• \( A \) — Area of Underground AC Wire (m²)
• \( P_{loss} \) — Line Losses (W)
• \( I \) — Current Underground AC (A)
• \( L \) — Length of Underground AC Wire (m)

Explanation: This formula calculates the resistivity of the wire material based on the power losses, current, and physical dimensions of the wire.

3. Importance of Resistivity Calculation

Details: Calculating resistivity is crucial for determining the electrical properties of materials, designing efficient electrical systems, and minimizing power losses in transmission lines.

4. Using the Calculator

Tips: Enter the area in square meters, line losses in watts, current in amperes, and length in meters. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What factors affect resistivity?
A: Resistivity is affected by temperature, material composition, and impurities in the material.

Q2: How does resistivity differ from resistance?
A: Resistivity is an intrinsic property of the material, while resistance depends on both the material's resistivity and its physical dimensions.

Q3: What are typical resistivity values for common materials?
A: Copper has low resistivity (~1.68×10⁻⁸ Ω·m), while rubber has very high resistivity (~10¹³ Ω·m).

Q4: Why is the factor of 2 in the denominator?
A: The factor of 2 accounts for the 2-phase system configuration in this specific calculation.

Q5: Can this calculator be used for DC systems?
A: While the basic principles are similar, this specific formula is designed for AC systems and may not be directly applicable to DC systems.