1. What is a Cable Power Loss Calculator?

Definition: This calculator estimates the power loss in electrical cables based on current, material resistivity, cable length, and cross-sectional area.

Purpose: It helps electrical engineers and technicians determine energy losses in cable systems for efficient power distribution.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \text{Loss} \) — Power loss (watts)
• \( I \) — Current (amps)
• \( \rho \) — Resistivity (ohm-m)
• \( L \) — Cable length (meters)
• \( A \) — Cross-sectional area (m²)

Explanation: The power loss increases with the square of current and length, while larger cable areas reduce the loss.

3. Importance of Power Loss Calculation

Details: Proper power loss estimation ensures efficient energy transmission, prevents overheating, and helps in selecting appropriate cable sizes.

4. Using the Calculator

Tips: Enter the current in amps, material resistivity (default 1.68×10⁻⁸ ohm-m for copper), cable length in meters, and cross-sectional area in m². All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is typical resistivity for copper?
A: Copper has ρ ≈ 1.68×10⁻⁸ ohm-m at 20°C. For aluminum, use 2.82×10⁻⁸ ohm-m.

Q2: How does temperature affect resistivity?
A: Resistivity increases with temperature. For precise calculations, use resistivity values at operating temperature.

Q3: Why is current squared in the formula?
A: Power loss is proportional to I²R, where R is resistance, making current the most significant factor.

Q4: How do I convert AWG to m²?
A: Use our AWG to Area Converter or refer to standard AWG size charts.

Q5: Does this include AC effects like skin effect?
A: No, this is the DC calculation. For AC systems, additional factors must be considered.