1. What is an LED Wire Voltage Drop Calculator?

Definition: This calculator estimates the voltage drop in LED wiring systems based on current, wire length, and resistance.

Purpose: It helps electrical engineers and LED installers ensure proper voltage levels reach their LED fixtures.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( V_d \) — Voltage drop (volts)
• \( I \) — Current (amperes)
• \( L \) — Wire length (feet)
• \( R \) — Resistance per 1000 feet (ohms/1000 ft)

Explanation: The factor of 2 accounts for the round-trip path of current (both positive and negative wires).

3. Importance of Voltage Drop Calculation

Details: Proper voltage drop estimation ensures LED lights receive sufficient voltage to operate correctly and maintain brightness.

4. Using the Calculator

Tips: Enter the current in amperes, wire length in feet, and resistance (default 1.98 ohms/1000 ft for 18 AWG copper wire). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why is voltage drop important for LEDs?
A: LEDs are sensitive to voltage changes; excessive drop can cause dimming, color shifts, or failure to light.

Q2: What's a typical resistance value?
A: For copper wire: 1.98 (18 AWG), 1.24 (16 AWG), 0.78 (14 AWG), or 0.49 (12 AWG) ohms/1000 ft.

Q3: What's an acceptable voltage drop?
A: Generally keep drop below 3% of supply voltage (0.36V for 12V systems, 0.72V for 24V).

Q4: How do I reduce voltage drop?
A: Use shorter runs, larger wire (lower AWG), or higher system voltage.

Q5: Does this account for temperature effects?
A: No, resistance increases with temperature - add 10-20% safety margin in hot environments.