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Electricity isn't perfectly efficient; as current travels through a wire, it meets resistance, causing some of the energy to be lost as heat. This loss results in a 'Voltage Drop' at the far end of the cable. For long wire runs—like powering a detached garage or a backyard shed—this drop can be significant, causing motors to burn out or lights to flicker. Our Voltage Drop Calculator helps you determine if your chosen wire gauge (AWG) is sufficient for the distance and current load of your project, ensuring your electrical installation is both safe and code-compliant.
Como funciona
This tool uses the standard resistance values for American Wire Gauge (AWG) copper conductors. It calculates the total resistance of the one-way distance (multiplied by 2 for the complete circuit) and applies Ohm's Law (V = I × R) to find the voltage lost across that resistance.
Fórmula de cálculo
V_drop = I × R_total
Calculation Examples
1. **Long Run**: A 120V circuit drawing 15A over 100ft using 14 AWG wire will have a **~7.5V drop (6.3%)**, which is excessive.
2. **Correction**: Using 10 AWG wire for the same run reduces the drop to **~3V (2.5%)**, which is safe.
Why use this tool in your daily life?
Professional-grade electrical safety. This service is a vital check for anyone powering detached buildings or outdoor equipment, helping you choose the right materials to prevent fire hazards and equipment damage.
Dica
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