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DC Voltage Drop Estimator

Estimate approximate DC voltage drop for a given current, length, and conductor resistance — educational design aid.

Voltage drop on a DC run is roughly I × R × 2 for a two-wire circuit (out and return). This tool uses simple resistivity assumptions for copper.

Copper assumed; ρ ≈ 0.0175 Ω·mm²/m

Enter values to estimate DC voltage drop (two-wire).

Need engineered numbers?

Calculators are educational. Project design requires qualified engineering.

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