1. What is Resistance Using Load Current?

Resistance Overhead AC is defined as the property of the wire or line that opposes the flow of current through it. This calculator determines the resistance based on line losses and current in a single-phase two-wire overhead system.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( R \) — Resistance Overhead AC (Ohm)
• \( P_{loss} \) — Line Losses (Watt)
• \( I \) — Current Overhead AC (Ampere)

Explanation: The formula calculates the resistance by dividing the power losses by twice the square of the current flowing through the system.

3. Importance of Resistance Calculation

Details: Accurate resistance calculation is crucial for determining power losses in transmission lines, optimizing system efficiency, and designing electrical distribution networks.

4. Using the Calculator

Tips: Enter line losses in watts and current in amperes. All values must be valid positive numbers greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: Why is resistance important in overhead AC systems?
A: Resistance determines the amount of power lost as heat in transmission lines, affecting overall system efficiency and voltage regulation.

Q2: What factors affect resistance in overhead lines?
A: Material composition, cross-sectional area, length of conductor, and temperature are the main factors affecting resistance.

Q3: How does current affect resistance calculation?
A: Since power loss is proportional to the square of current (I²R losses), higher currents result in significantly higher power losses for the same resistance.

Q4: Why is the formula divided by 2?
A: In a single-phase two-wire system, the total resistance includes both the go and return paths, hence the division by 2.

Q5: Can this calculator be used for DC systems?
A: While the basic principle is similar, AC systems have additional considerations like skin effect and proximity effect that may affect resistance calculations.