1. What is Voltage Drop?

Voltage drop is the reduction in voltage in an electrical circuit between the source and load. It occurs due to the resistance in conductors and can affect equipment performance.

2. How Does the Calculator Work?

The calculator uses the voltage drop equation:

Where:

• \( VD \) — Voltage drop (volts, V)
• \( L \) — Length of wire (feet)
• \( I \) — Current (amperes, A)
• \( R \) — Resistance per 1000 feet (Ω/1000 ft)

Explanation: The equation accounts for both the outgoing and return paths (hence the factor of 2) in a typical circuit.

3. Importance of Voltage Drop Calculation

Details: Proper voltage drop calculation ensures electrical devices receive adequate voltage to operate correctly and helps prevent energy waste and potential safety issues.

4. Using the Calculator

Tips: Enter wire length in feet, current in amperes, and resistance per 1000 feet. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is an acceptable voltage drop?
A: Typically, less than 3% for branch circuits and 5% for feeder and branch circuits combined is recommended.

Q2: How do I find the resistance value for my wire?
A: Consult wire manufacturer specifications or standard resistance tables for copper wire at specific gauges.

Q3: Why is the length multiplied by 2?
A: This accounts for both the "hot" and "neutral" (or positive and negative) conductors in a complete circuit.

Q4: Does this work for both AC and DC circuits?
A: Yes, for simple DC circuits or AC circuits where reactance can be neglected (short runs at power frequencies).

Q5: How can I reduce voltage drop?
A: Use larger wire (lower gauge number), reduce circuit length, or decrease the load current.